Discover our teachers

23651 tutors available

Excellent ( 4.7 )

1.8 million student reviews

The list of tutors

Amir

Egypt Lake-Leto, United States (online)

Amir ehab abdelhakim, artificial intelligence student, offers programming and ai courses for all levels with a simple and personalized teaching method

$33/h
1^st lesson free

Harsh

Ghaziabad, India (face to face & online)

Msc, bsc computer science | 5-time national ai competition winner | ugc net 96 percentile | google caf (2x) | expert tutoring in cs fundamentals, programming, ai and advanced concepts.

$7/h
1^st lesson free

Harishkumar

Vilathikulam, India (online)

I'm a ml engineering and i have a strong foundation in python and frontend development

$6/h
1^st lesson free

Kalash

Indore, India (online)

Python tutor with 4+ years of industry experience | learn coding the practical way

$30/h
1^st lesson free

Shruti

Bhopal, India (online)

Experienced java tutor offering practical coding, oop concepts and dsa for college students

$4/h
1^st lesson free

Ayaan

Nagpur, India (face to face & online)

Want to become a industry ready programmer, here is your chance, start your journey now

$22/h
1^st lesson free

Manshi

Dehradun, India (face to face & online)

I'm an assistant professor with one year experience and excellent knowledge of python, ai, machine learning because of my domain

$22/h
1^st lesson free

Emmanuel

Stockton-on-Tees, United Kingdom (online)

Beginner-friendly python, programming and ai lessons with real-world examples. step-by-step guidance, hands-on projects, and patient support to build confidence and strong coding skills.

$29/h
1^st lesson free

Chyaban

Panikhaiti, India (face to face & online)

Start programming from zero to advance and grow more in programming field

$15/h
1^st lesson free

Shuja

Sharjah, United Arab Emirates (face to face & online)

Graduate with a bachelors degree in software engineering and passion for teaching

$20/h
1^st lesson free

Nani nalli

Secunderabad, India (online)

Experienced ai and machine learning student tutor specializing in java and data structures

$15/h
1^st lesson free

Abhishek

Hyderabad, India (online)

Dsa mentor | c++ specialist | 1818 leetcode global rank | 1000+ leetcode question | software engineer in an mnc

$9/h
1^st lesson free

H a

Huntington Beach, United States (online)

Python made simple – learn coding easily, gain confidence, build projects, and master every concept

$21/h
1^st lesson free

Yatan

New Delhi, India (online)

I'm an engineering student and i teach maths and physics (upto high school i.e. grade 12th level) and computer programming (c, c++, java, python, sql) for beginners.

$4/h
1^st lesson free

Khushi

Mumbai, India (face to face & online)

Learn html, css, sql & programming languages with easy explanations. let's begin learning now!

$16/h
1^st lesson free

Sahil

Greater Noida, India (online)

I teach computer science to students up to class 10, making coding and tech simple, fun, and practical through hands-on projects and real-life examples.

$7/h
1^st lesson free

Mayank

Bhopal, India (online)

B.tech ai & ml graduate teaching java, python, and full-stack web programming with hands-on project-based learning and personalized guidance"

$7/h
1^st lesson free

Rob

Halifax, Canada (online)

It professional with over 25 years experience in the information technology field. background included teaching software development, operating systems, networking and security.

$25/h
1^st lesson free

Dino

New York, United States (online)

Full-time software developer and tech lead with a part-time role in devops, specializing in fintech projects focused on trading platforms and blockchain technologies.

$21/h
1^st lesson free

Ermin

New York, United States (online)

Gradute of electrical engeneering, all types of programming courses and computer sciences/tech

$29/h
1^st lesson free

Clay

Latur, India (online)

I am a computer science engineer teaching c, c++, java, and mern with practical real-world projects

$7/h
1^st lesson free

Aarzu

Dubai, United Arab Emirates (online)

Experienced engineering graduate and skilled programming tutor with two years teaching experience masters in engineering graduate offering programming language tutoring for bachelor-level students

$27/h
1^st lesson free

Debojyoti

Kolkata, India (face to face & online)

Learn programming from bca graduate and data scientist at alholic india pvt teacher.

$4/h
1^st lesson free

Chetan

Bengaluru, India (face to face & online)

5 (1 review)
New

Amazon software engineer with expertise in golang, distributed systems, kafka and scalable microservices design

$30/h
1^st lesson free

Gorakati

Chennai, India (online)

Hello , this is teja pursuing my bachelor's in cs , undergraduate in a university i can explain programming languages in easy way

$7/h
1^st lesson free

Muddashir

Bengaluru, India (online)

B.tech graduate expert in programming basics with python as a primary language.

$18/h
1^st lesson free

Akshat

Rohtak, India (online)

I'm an nit student and have proficiency in computer programming with various languages including c, c++, java, python. i have also helped students with their coding assignments. i also know other su

$22/h
1^st lesson free

Arul

Vellore, India (online)

Passionate and dedicated tutor eager to join a reputed company. strong subject knowledge with proven teaching skills. seeking an opportunity to guide and inspire students

$7/h
1^st lesson free

Sonam

Indian Rocks Beach, United States (online)

From basics to coding pro – learn computer science online with ease! step-by-step guidance, clear concepts, and exam-focused learning to help you excel in cs.

$21/h
1^st lesson free

Anuj

Liverpool, United Kingdom (online)

Master coding from scratch – learn programming in the easy way and from corporate experienced trainer - learn python, javascript, php & more

$48/h
1^st lesson free

Shivansh

Indore, India (online)

I can teach to become a good programmer.you can develop android application

$7/h
1^st lesson free

Farhan

London, United States (face to face & online)

Experienced programming tutor offering programming language classes. personalized lessons in c++, python, html/css/js, sql, databases, django.

$13/h
1^st lesson free

Piyush

Meerut, India (face to face & online)

I am a python developer working as a freelancer and i teach python programming to students from beginner to intermediate level

$6/h
1^st lesson free

Gurmanthan

Miran Sahib, India (face to face & online)

Master computer programming with expert guidance – learn, build, and code like pro

$2/h
1^st lesson free

Pavithra

Chennai, India (online)

Ugc net qualified educator in the branch of computer science... passionate about educating young minds ...

$15/h
1^st lesson free

Deepak

Mira Bhayandar, India (face to face & online)

Experienced java professional teaches java from beginner to advanced level. i teach with simple and effective methodology.

$18/h
1^st lesson free

Shaik

Kadapa, India (online)

Fazar graduate in computer science and teaches computer all levels personal and easy-going methodology

$25/h
1^st lesson free

Fahim

Southend-on-Sea, United Kingdom (face to face & online)

Learn basic computer programming from experienced software engineer with hands-on projects and personal guidance.

$38/h
1^st lesson free

Naheel

Malappuram, India (online)

Valedictorian in computer applications, now pursuing master’s with expertise in teaching and projects

$18/h
1^st lesson free

Anupam

Noida, India (online)

Ai and computer science tutor | final-year b.tech student making complex concepts simple through real-life examples

$18/h
1^st lesson free

Laxmi

Bengaluru, India (face to face & online)

B.e(electronics ) developer ,10 years it experience -i teach computer programming languages ,dsa and sql .

$4/h
1^st lesson free

Ashok kumar

Alwar, India (face to face & online)

We have more than 6+ years of experience as a software engineer

$24/h
1^st lesson free

Basma

New York, United States (online)

Learn ai, data science, and python from an experienced researcher with real-world project insights.

$29/h
1^st lesson free

Nidhi

Lucknow, India (online)

Master's in technology with computer science can teach html,css,java dsa and oops concepts

$22/h
1^st lesson free

Amritansh

Greater Noida, India (online)

Programming made easy! learn java, python, javascript with practical and real-world teaching.

$10/h
1^st lesson free

Vishal

Ambala, India (online)

5 (1 review)
New

Learn programming languages like c, c++, python, data structure, automata theory etc.

$7/h
1^st lesson free

Aditya

Edinburgh, United Kingdom (online)

Experienced software engineer | helping students master programming & problem solving | 6+ years in software development | learn real-world coding skills from a pro

$46/h
1^st lesson free

Umar

Ibadan, Nigeria (online)

Learn web development and programming from scratch — html, css, javascript and real-world projects

$4/h
1^st lesson free

Bhupendra

Jaipur, India (online)

Computer teaching from basic :- angular . react . php . laravel . css . bootstrap. mysql . mongodb .

$6/h
1^st lesson free

Mohd

Saharanpur, India (face to face & online)

Fast track java, c & web development – spring boot & html/css with personal mentorship

$15/h
1^st lesson free

Sohibe

Cairo, United States (online)

High school student, mastered python, and made lots of projects with it, done.

$29/h
1^st lesson free

Reza

Kishanganj, India (face to face & online)

I am an iit student of programming and data science. i teach programming languages: python (including flask), html, css, javascript, vue.js and also data science & ml concepts.

$7/h
1^st lesson free

Kesavan

Chettikurichi, India (online)

Computer teacher professional oder.teaching professional seeks opportunity nurturing young minds with expertise.

$2/h
1^st lesson free

Akash

Singapore, Singapore (face to face & online)

Masters student at nanyang technological university, singapore. have 3 years of experience in software development, worked in boeing as a full stack developer

$28/h
1^st lesson free

Akash

Mumbai, India (online)

Dean’s list awardee & iiit delhi ta teaches coding, english, math and school subjects online

$18/h
1^st lesson free

Promise

Benoni, South Africa (online)

Software developer and consultant, provides one-on-one guidance and mentorship for students of all levels, focusing on personalized learning plans and practical project-based training.

$21/h
1^st lesson free

Adarsh

Dombivli, India (online)

I'm a vjti mumbai student with 6+ years of python experience, teaching practical coding and problem-solving to students in mumbai with real-world projects.

$7/h
1^st lesson free

Sanskar

Juna, India (online)

Atal bihari vajpayee state university post grad teaching foundation of basic programming and programming languages.

$15/h
1^st lesson free

Ankan

Kolkata, India (online)

B.tech in cse (ai/ml) graduate teaches programming, algorithms, and applied machine learning with real-world examples

$22/h
1^st lesson free

Ritesh

Mumbai, India (online)

Programming & math tutor learn coding and math step by step with easy, personalized lessons. build logic, solve problems, and boost your skills fast.

$15/h
1^st lesson free

Aaryaman

Hyderabad, India (online)

Leverage my 4 years of industry experience as an mnc data scientist to master python, maths, and statistics. learn the practical, real-world applications of these subjects from an expert who uses them

$22/h
1^st lesson free

Tayden

Cape Town, South Africa (online)

I am a talented developer with lots of knowledge to share with others

$21/h
1^st lesson free

Sonu

New Delhi, India (online)

I am a php professional with 9 years of experience. i specialize in teaching php and helping others learn it faster and more effectively.

$15/h
1^st lesson free

Bushra

Storm Lake, United States (online)

Learn coding, math, and english with a pucit computer science graduate who makes learning easy and effective

$14/h
1^st lesson free

Md sajid

Kolkata, India (online)

I'm a software engineer and cse graduate who teaches java and dsa with real-world coding practice for all ages

$9/h
1^st lesson free

Animish

Nashik, India (online)

Hi! i’m animish, a computer science graduate who loves teaching coding. i make complex topics simple with clear, step-by-step lessons tailored to your pace, helping you build confidence and real progr

$22/h
1^st lesson free

Ishan

New Delhi, India (online)

Researcher and developer working in the ai industry - i have been teaching ai / ml for the past 3 years at ai-ml club, dtu making industry level engineers

$22/h
1^st lesson free

Sahil

Navi Mumbai, India (online)

Learn java, python, c & full stack development from a certified, hands-on instructor!

$12/h
1^st lesson free

Lucky

Ahmedabad, India (online)

"teaching computer programming: shaping logical thinkers, innovators, and future tech leaders and innovation "

$9/h
1^st lesson free

Hadi

Lebanon, United States (face to face & online)

Learn web development and coding with real projects, fast and easy ,start today!!

$26/h
1^st lesson free

Harini

Hyderabad, India (face to face & online)

Hi! i’m a software developer with a passion for teaching both school students and aspiring coders.

$15/h
1^st lesson free

Shubham

Jamshedpur, India (online)

I am a results-driven full stack developer with expertise in mern stack, t3 stack, fastapi, and a deep passion for blockchain & web3 technologies.

$10/h
1^st lesson free

Purshottam j

Nagpur, India (face to face & online)

Public cloud computing expert aws, ms azure, gcp. corporate trainer with multiple mncs and caltech university, usa, purdue university usa, iit guwahati

$30/h
1^st lesson free

Anvesh

Noida, India (online)

I am a professional programmer currently working as a senior software engineer. if you're looking for a coding teacher or mentor, feel free to connect with me directly.

$15/h
1^st lesson free

Amritava

New Delhi, India (online)

Logic building with programming, teaches how to efficiently use ai to understand things, ultimately leading to learning anything.

$4/h
1^st lesson free

Prince

Naples, United States (online)

Anyone can join who wants to learn coding language.... helping in computer subject..

$29/h
1^st lesson free

Hima

Anantapur, India (online)

Learn c, python, html, css, sql with clear explanations | doubt clarification & guidance for success

$7/h
1^st lesson free

Sridhar

Hyderabad, India (online)

Online coding & cs tutor | ph.d. in cse | teaching java, dsa, dbms, and cloud tech

$22/h
1^st lesson free

Malvika

Agra, India (online)

Hi, i am a delhi university graduate with a bachelor of commerce. i have been in the teaching field for the past 5 years. i am currently teaching scratch programming language to uk/us students with an

$15/h
1^st lesson free

Joseph

Tadworth, United Kingdom (face to face & online)

5 (1 review)
New

Qualified software engineer, i work as the lead developer of a saas company named jeffreyai, in which i lead a team of three developers. i also contract out to a company named carbon and finch.

$38/h
1^st lesson free

Sneha

Coventry, United States (online)

I am a passionate and experienced teaching professional, offering personalized online tuition in computer science and mathematics.

$27/h
1^st lesson free

Sooraj

Edinburg, United States (online)

Expert python & c tutor | ₹1000/hr | live online classes description: taught us student with great results! get help with c/python, homework, or daily 1–3 hr sessions. clear, hands-on teaching tailor

$30/h
1^st lesson free

Bushra

Abu Dhabi, United Arab Emirates (online)

Motivated and tech-savvy associate professor with 7+ years of experience in academic. specializing in computer science education

$39/h
1^st lesson free

Rachit

Bengaluru, India (online)

Master programming with a product engineer solving problems at scale — c#, go & more

$223/h
1^st lesson free

Vivek

Raebareli, India (online)

I am a b.a., b.ed graduate and also a certified o level (computer) professional with 4 years of experience in teaching. i specialize in subjects like computer basics

$12/h
1^st lesson free

Sarthak

Gurugram, India (face to face & online)

Hey, i’m sarthak, a computer science engineer with 2 years of professional experience in backend systems, data structures, and cloud tech. if you’re tired of just "running code" without getting what's

$15/h
1^st lesson free

Mahi

Lucknow, India (face to face & online)

I am a professional coding tutor with a year of experience in tech field.

$15/h
1^st lesson free

Ayan

Ghaziabad, India (face to face & online)

Myself ayan, currently i am doing btech with csd, i did my 12th and 10th from cbse board, where in 12th i scored 95 in computer science. thanks

$18/h
1^st lesson free

Nihar

Bengaluru, India (online)

I am currently working in a subsidiary of samsung semiconductors. i would love to teach and pass on the knowledge that i can learnt over the years and help accomplish everyone's dream of reaching the

$7/h
1^st lesson free

Mariam

Cairo, United States (online)

Software engineer teaches kids real-world coding: python, c++, arduino, robotics, and web

$17/h
1^st lesson free

Hardik

Ghaziabad, India (online)

I'm a iiit student teaching programming, python, c++, machine learning & ai with a deep focus on concepts and clarity

$15/h
1^st lesson free

Logan

Charlottetown, Canada (face to face & online)

Computer science graduate from upei, currently working towards a bed to teach high school math, and science. i have a very social methodology to teaching as i believe that if you don't like listening

$24/h
1^st lesson free

Arastu

Bengaluru, India (online)

Experienced computer science student teaching python, java, and web development with real-world projects

$15/h
1^st lesson free

Gaurav

Denver, United States (online)

Software professional, teaches coding to students from mid school to graduate level.

$29/h
1^st lesson free

New Delhi, India (online)

Learn computer science for classes 9-12—cbse, ib, cambridge—with real-world coding, logic, and clarity.

$24/h
1^st lesson free

Arpit

Bhubaneswar, India (online)

I'm a college student and i teach java and python to students

$18/h
1^st lesson free

Vishal

Pune, India (online)

I'm a passionate ib diploma cs mentor who simplifies concepts, guides ia step-by-step, and delivers a personalized, student-loved learning experience

$27/h
1^st lesson free

Arsh

Kanpur, India (online)

I'm a bca student and i teach programming languages like c, c++, python, html & css to school and college students. i focus on practical learning and logic building, and i offer both online and offlin

$5/h
1^st lesson free

Kannugudi West Chief, India (face to face & online)

Do you want learn computer, then i will teach you more interesting guys

$22/h
1^st lesson free

Dheeraj

Gaujajali Bichli, India (face to face & online)

Software engineer experience of 2 years in real-life projects with use of html, javascript

$37/h
1^st lesson free

Likitha

Jagdalpur, India (face to face & online)

Experienced java and web developer of 4 years. hands-on experience with responsive websites.

$9/h
1^st lesson free

Sudipta

Hyderabad, India (face to face & online)

Azure cloud with c# dot net and python, generative ai with 13+ years experience in providing training. be a professional in cloud with real life project across industry.

$4/h
1^st lesson free

Essential information about your programming languages lessons
✅ Average price :	$18/h
✅ Average response time :	3h
✅ Tutors available :	23651
✅ Lesson format :	Face-to-face or online

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Discover our teachers

23651 tutors available

The list of tutors

Amir ehab abdelhakim, artificial intelligence student, offers programming and ai courses for all levels with a simple and personalized teaching method

Msc, bsc computer science | 5-time national ai competition winner | ugc net 96 percentile | google caf (2x) | expert tutoring in cs fundamentals, programming, ai and advanced concepts.

I'm a ml engineering and i have a strong foundation in python and frontend development

Python tutor with 4+ years of industry experience | learn coding the practical way

Experienced java tutor offering practical coding, oop concepts and dsa for college students

Want to become a industry ready programmer, here is your chance, start your journey now

I'm an assistant professor with one year experience and excellent knowledge of python, ai, machine learning because of my domain

Beginner-friendly python, programming and ai lessons with real-world examples. step-by-step guidance, hands-on projects, and patient support to build confidence and strong coding skills.

Start programming from zero to advance and grow more in programming field

Graduate with a bachelors degree in software engineering and passion for teaching

Experienced ai and machine learning student tutor specializing in java and data structures ​

Dsa mentor | c++ specialist | 1818 leetcode global rank | 1000+ leetcode question | software engineer in an mnc

Python made simple – learn coding easily, gain confidence, build projects, and master every concept

I'm an engineering student and i teach maths and physics (upto high school i.e. grade 12th level) and computer programming (c, c++, java, python, sql) for beginners.

Learn html, css, sql & programming languages with easy explanations. let's begin learning now!

I teach computer science to students up to class 10, making coding and tech simple, fun, and practical through hands-on projects and real-life examples.

B.tech ai & ml graduate teaching java, python, and full-stack web programming with hands-on project-based learning and personalized guidance"

It professional with over 25 years experience in the information technology field. background included teaching software development, operating systems, networking and security.

Full-time software developer and tech lead with a part-time role in devops, specializing in fintech projects focused on trading platforms and blockchain technologies.

Gradute of electrical engeneering, all types of programming courses and computer sciences/tech

I am a computer science engineer teaching c, c++, java, and mern with practical real-world projects

Experienced engineering graduate and skilled programming tutor with two years teaching experience masters in engineering graduate offering programming language tutoring for bachelor-level students

Learn programming from bca graduate and data scientist at alholic india pvt teacher.

Amazon software engineer with expertise in golang, distributed systems, kafka and scalable microservices design

Hello , this is teja pursuing my bachelor's in cs , undergraduate in a university i can explain programming languages in easy way

B.tech graduate expert in programming basics with python as a primary language.

I'm an nit student and have proficiency in computer programming with various languages including c, c++, java, python. i have also helped students with their coding assignments. i also know other su

Passionate and dedicated tutor eager to join a reputed company. strong subject knowledge with proven teaching skills. seeking an opportunity to guide and inspire students

From basics to coding pro – learn computer science online with ease! step-by-step guidance, clear concepts, and exam-focused learning to help you excel in cs.

Master coding from scratch – learn programming in the easy way and from corporate experienced trainer - learn python, javascript, php & more

I can teach to become a good programmer.you can develop android application

Experienced programming tutor offering programming language classes. personalized lessons in c++, python, html/css/js, sql, databases, django.

I am a python developer working as a freelancer and i teach python programming to students from beginner to intermediate level

Master computer programming with expert guidance – learn, build, and code like pro

Ugc net qualified educator in the branch of computer science... passionate about educating young minds ...

Experienced java professional teaches java from beginner to advanced level. i teach with simple and effective methodology.

Fazar graduate in computer science and teaches computer all levels personal and easy-going methodology

Learn basic computer programming from experienced software engineer with hands-on projects and personal guidance.

Valedictorian in computer applications, now pursuing master’s with expertise in teaching and projects

Ai and computer science tutor | final-year b.tech student making complex concepts simple through real-life examples

B.e(electronics ) developer ,10 years it experience -i teach computer programming languages ,dsa and sql .

We have more than 6+ years of experience as a software engineer

Learn ai, data science, and python from an experienced researcher with real-world project insights.

Master's in technology with computer science can teach html,css,java dsa and oops concepts

Programming made easy! learn java, python, javascript with practical and real-world teaching.

Learn programming languages like c, c++, python, data structure, automata theory etc.

Experienced software engineer | helping students master programming & problem solving | 6+ years in software development | learn real-world coding skills from a pro

Learn web development and programming from scratch — html, css, javascript and real-world projects

Computer teaching from basic :- angular . react . php . laravel . css . bootstrap. mysql . mongodb .

Fast track java, c & web development – spring boot & html/css with personal mentorship

High school student, mastered python, and made lots of projects with it, done.

I am an iit student of programming and data science. i teach programming languages: python (including flask), html, css, javascript, vue.js and also data science & ml concepts.

Computer teacher professional oder.teaching professional seeks opportunity nurturing young minds with expertise.

Masters student at nanyang technological university, singapore. have 3 years of experience in software development, worked in boeing as a full stack developer

Dean’s list awardee & iiit delhi ta teaches coding, english, math and school subjects online

Software developer and consultant, provides one-on-one guidance and mentorship for students of all levels, focusing on personalized learning plans and practical project-based training.

I'm a vjti mumbai student with 6+ years of python experience, teaching practical coding and problem-solving to students in mumbai with real-world projects.

Atal bihari vajpayee state university post grad teaching foundation of basic programming and programming languages.

B.tech in cse (ai/ml) graduate teaches programming, algorithms, and applied machine learning with real-world examples

Programming & math tutor learn coding and math step by step with easy, personalized lessons. build logic, solve problems, and boost your skills fast.

Leverage my 4 years of industry experience as an mnc data scientist to master python, maths, and statistics. learn the practical, real-world applications of these subjects from an expert who uses them

I am a talented developer with lots of knowledge to share with others

I am a php professional with 9 years of experience. i specialize in teaching php and helping others learn it faster and more effectively.

Learn coding, math, and english with a pucit computer science graduate who makes learning easy and effective

I'm a software engineer and cse graduate who teaches java and dsa with real-world coding practice for all ages

Hi! i’m animish, a computer science graduate who loves teaching coding. i make complex topics simple with clear, step-by-step lessons tailored to your pace, helping you build confidence and real progr

Researcher and developer working in the ai industry - i have been teaching ai / ml for the past 3 years at ai-ml club, dtu making industry level engineers

Learn java, python, c & full stack development from a certified, hands-on instructor!

"teaching computer programming: shaping logical thinkers, innovators, and future tech leaders and innovation "

Learn web development and coding with real projects, fast and easy ,start today!!

Hi! i’m a software developer with a passion for teaching both school students and aspiring coders.

I am a results-driven full stack developer with expertise in mern stack, t3 stack, fastapi, and a deep passion for blockchain & web3 technologies.

Public cloud computing expert aws, ms azure, gcp. corporate trainer with multiple mncs and caltech university, usa, purdue university usa, iit guwahati

I am a professional programmer currently working as a senior software engineer. if you're looking for a coding teacher or mentor, feel free to connect with me directly.

Logic building with programming, teaches how to efficiently use ai to understand things, ultimately leading to learning anything.

Anyone can join who wants to learn coding language.... helping in computer subject..

Learn c, python, html, css, sql with clear explanations | doubt clarification & guidance for success

Experienced ai and machine learning student tutor specializing in java and data structures