Technical knowledge

By Varun Singla - Gate Smashers

The default Indian go-to for full OS, DBMS and CN playlists, one concept per short video.

• Hinglish
• Free
• All levels

Verified 2026-07-09

By Neso Academy

The most rigorous free English computer networks plus TOC and digital logic, textbook-grade.

• English
• Free
• Intermediate

Verified 2026-07-09

By Shridhar Mankar - 5 Minutes Engineering

Ultra-short explainers, perfect night-before-interview refreshers.

• Hinglish
• Free
• All levels

Verified 2026-07-09

By Sanchit Jain - KnowledgeGATE

One-shot full-subject revision marathons, like DBMS in 100 minutes.

• Hinglish
• Free
• All levels

YouTube marathons are free; the site also sells structured courses.

Verified 2026-07-09

By Jayanti Khatri Lamba - Jenny's Lectures

Patient whiteboard lectures on OS, CN and data structures in C, great for exams too.

• Hinglish
• Free
• Beginner

Verified 2026-07-09

By GeeksforGeeks

THE canonical last-minute revision sheets for every core subject, updated for 2026.

• English
• Free
• All levels

Verified 2026-07-09

By InterviewBit (Scaler)

Interview-phrased Q&A for DBMS, CN, OOP and Java, updated for 2026.

• English
• Free
• Intermediate

Verified 2026-07-09

By Raj Vikramaditya (Striver) - takeUforward

A tight set of 50+ must-do OS, DBMS and CN questions for SDE rounds.

• English
• Free
• Intermediate

Verified 2026-07-09

By Tpoint Tech

Broad tutorials plus large interview question banks across CS subjects.

• English
• Free
• Beginner

Rebranded from javatpoint in March 2025; use the new tpointtech.com name and URL.

Verified 2026-07-09

By NPTEL (IITs and IISc)

IIT-professor courses across the entire CS curriculum.

• English
• Free
• Intermediate

Course content is free; the proctored certificate costs about Rs. 1,000 or more.

Verified 2026-07-09

By Aditya Verma

THE dynamic programming and recursion playlists; evergreen and pattern-first.

• Hinglish
• Free
• Intermediate

Verified 2026-07-09

By Mazhar Imam Khan - codestorywithMIK

Daily LeetCode problem-of-the-day solutions; the habit-building companion, active in 2026.

• Hinglish
• Free
• Intermediate

Verified 2026-07-09

By Abdul Bari

The legendary 84-video algorithms theory series that fills every conceptual gap.

• English
• Free
• All levels

Verified 2026-07-09

By William Fiset

The definitive free graph theory course.

• English
• Free
• Advanced

Verified 2026-07-09

By Kamil Debowski - Errichto

Advanced competitive programming from a world-class contestant.

• English
• Free
• Advanced

Verified 2026-07-09

By mycodeschool

The classic archive for pointers, linked lists and trees, still unmatched for clarity.

• English
• Free
• Beginner

Verified 2026-07-09

By Dr. Steven Halim - National University of Singapore

Interactive animations of every core data structure and algorithm.

• English
• Free
• All levels

Verified 2026-07-09

By Navin Reddy - Telusko

The Java path for TCS, Accenture and Infosys interviews, plus solid Python.

• English
• Free
• Beginner

Verified 2026-07-09

By Haris Ali Khan - CodeWithHarry

India's biggest free Hindi full-language courses, from C to Python to web.

• Hindi
• Free
• Beginner

YouTube courses are free; the site also sells paid tracks.

Verified 2026-07-09

By Corey Schafer

Gold-standard Python deep dives on the topics interviews actually probe.

• English
• Free
• Intermediate

Verified 2026-07-09

By Bro Code (Chris)

Free 4 to 12 hour full-language courses when you want one video, start to finish.

• English
• Free
• Beginner

Credited by handle; the creator's full name is not published.

Verified 2026-07-09

By Quincy Larson - freeCodeCamp

Fully free interactive curriculum, including certifications at no cost.

• English
• Free
• Beginner

Verified 2026-07-09

By Alex (author, credited by first name) - LearnCpp

The consensus best free way to learn modern C++ properly.

• English
• Free
• All levels

Author is credited by first name; full name is not published.

Verified 2026-07-09

By Ilya Kantor - javascript.info

The most thorough free JavaScript book on the web.

• English
• Free
• All levels

Verified 2026-07-09

By Python Software Foundation

The reference of record; the official tutorial is better than most courses.

• English
• Free
• All levels

Verified 2026-07-09

By Donne Martin

The most-starred free system design resource on GitHub, around 348K stars.

• English
• Free
• Intermediate

Verified 2026-07-09

By Alex Xu - ByteByteGo

Crisp visual system design explainers from the author of the famous book series.

• English
• Freemium
• Intermediate

YouTube, the free newsletter tier and a free 158-page PDF are free; the full course is paid.

Verified 2026-07-09

By Gaurav Sen

The classic free system design playlist most Indian engineers started with.

• English
• Free
• Intermediate

Verified 2026-07-09

By Arpit Bhayani - Asli Engineering

Deep dives into how real systems work internally, beyond interview surface answers.

• English
• Free
• Advanced

Verified 2026-07-09

By The Odin Project

The most job-realistic fully free full-stack path, built around real projects.

• English
• Free
• Beginner

Verified 2026-07-09

By Kamran Ahmed - roadmap.sh

Role-based roadmaps that answer 'what do I learn next' for every dev path.

• English
• Free
• All levels

Verified 2026-07-09

By Brad Traversy - Traversy Media

Crash courses that get you productive in a new tool in one sitting.

• English
• Free
• Beginner

Verified 2026-07-09

By Hitesh Choudhary - Chai aur Code

Production-minded JavaScript and backend teaching in Hindi.

• Hindi
• Free
• Intermediate

Verified 2026-07-09

By Mozilla

The reference of record for HTML, CSS and JavaScript.

• English
• Free
• All levels

Verified 2026-07-09

By W3Schools (Refsnes Data)

A gentle sandbox with try-it-yourself editors for first contact with web tech.

• English
• Free
• Beginner

Learning content is free; certificates are a paid extra.

Verified 2026-07-09

By Krish Naik

End-to-end applied ML and MLOps; the most placement-relevant Indian AI channel.

• English
• Free
• Intermediate

Verified 2026-07-09

By Nitish Singh - CampusX

The best structured free Hindi machine learning course.

• Hindi
• Free
• Beginner

Verified 2026-07-09

By Josh Starmer - StatQuest

The math behind ML, clearly explained one concept at a time.

• English
• Free
• All levels

Verified 2026-07-09

By Grant Sanderson - 3Blue1Brown

Visual intuition for linear algebra, calculus and neural networks.

• English
• Free
• All levels

Verified 2026-07-09

By Andrew Ng - DeepLearning.AI on Coursera

The world's default first ML course, gentle and rigorous at once.

• English
• Freemium
• Beginner

Coursera audit is free but videos only; graded assignments and the certificate are paid.

Verified 2026-07-09

By Kaggle (Google)

Hands-on micro-courses with certificates that are fully free.

• English
• Free
• Beginner

Verified 2026-07-09

By Jeremy Howard - fast.ai

Top-down deep learning: build working models first, theory second.

• English
• Free
• Intermediate

Verified 2026-07-09

By Raj Vikramaditya (Striver) - takeUforward

The de-facto Indian DSA syllabus: about 450 ordered problems, each with a free video and article.

• English
• Free
• All levels

Fully free; the TUF+ paid tier is optional.

Verified 2026-07-09

By Raj Vikramaditya (Striver) - takeUforward

About 180 most-asked interview problems; the 79 sheet is the last-moment revision lap.

• English
• Free
• Intermediate

Step 2 of the rank-1 Striver pipeline: A2Z first, then SDE, then 79 for revision.

Verified 2026-07-09

By Love Babbar (ex-Amazon, Microsoft) - CodeHelp

The original viral 450-question grind sheet, with superb Hindi C++ lectures.

• Hinglish
• Free
• All levels

The recommended pick for the Hindi-first route.

Verified 2026-07-09

By Aman Dhattarwal & Shradha Khapra (ex-Microsoft) - Apna College

The gentlest day-0 on-ramp for absolute beginners.

• Hinglish
• Free
• Beginner

YouTube content is free; the Alpha course is paid. Good 3-4 week on-ramp before Striver.

Verified 2026-07-09

By Kunal Kushwaha - WeMakeDevs

Java-first DSA with especially strong recursion and binary search.

• English
• Free
• Beginner

The bootcamp is incomplete (no dynamic programming); pair it with Aditya Verma for DP.

Verified 2026-07-09

By Haris Ali Khan - CodeWithHarry

Pure-Hindi DSA in C for Hindi-first learners.

• Hindi
• Free
• Beginner

Good 3-4 week on-ramp for absolute beginners before a full sheet.

Verified 2026-07-09

By Anuj Kumar Sharma (ex-Amazon) - Anuj Bhaiya

A compact, friendly full-DSA course.

• Hinglish
• Free
• Beginner

Verified 2026-07-09

By GeeksforGeeks

Habit-forming one-problem-a-day structure with a free completion certificate.

• English
• Free
• All levels

Part of the rank-3 GeeksforGeeks combo in the essential pipeline.

Verified 2026-07-09

By Apni Kaksha

Older DSA lectures that some learners still search for.

• Hinglish
• Free
• Beginner

Legacy content, the channel now focuses on JEE. Prefer Apna College or Striver for new prep.

Verified 2026-07-09

By Navdeep Singh - NeetCode

The cleanest pattern-based roadmap with the best solution videos anywhere.

• English
• Freemium
• Intermediate

Roadmap, problem lists and solution videos are free; NeetCode Pro courses are paid.

Verified 2026-07-09

By Yangshun Tay (author of Blind 75)

A time-boxed plan generator plus behavioral and resume guidance from the Blind 75 author.

• English
• Free
• Intermediate

Verified 2026-07-09

By David Malan - Harvard University

The world's most loved intro to computer science, free to take end to end.

• English
• Free
• Beginner

Free to audit and complete; the verified certificate is paid.

Verified 2026-07-09

By Erik Demaine - MIT OpenCourseWare

University-grade algorithms theory when you want real depth.

• English
• Free
• Advanced

Verified 2026-07-09

By Pavel Mavrin - ITMO University

Interactive lessons on core algorithm techniques from a legendary ICPC coach.

• English
• Free
• Advanced

Verified 2026-07-09

By USACO Guide team

A structured competitive-programming curriculum from bronze to platinum.

• English
• Free
• Advanced

Verified 2026-07-09

By Clement Mihailescu - AlgoExpert

Polished paid video explanations for 200 hand-picked interview questions.

• English
• Paid
• Intermediate

Paid only, no meaningful free tier. Listed as a paid option; everything else here has a free path.

Verified 2026-07-09

By LeetCode

The global interview-question arena; the free tier is enough for fresher prep.

• English
• Freemium
• All levels

Premium is optional for freshers; the free tier covers the essential lists.

Verified 2026-07-09

By GeeksforGeeks

India's largest CS practice and article library, from DSA to interview experiences.

• English
• Freemium
• All levels

Rank 3 together with GfG 160; the core practice and articles are free.

Verified 2026-07-09

By HackerRank

Mirrors the online-assessment format Indian MNCs actually test on.

• English
• Free
• Beginner

Verified 2026-07-09

By CodeChef

Beginner-friendly Indian competitive programming with regular rated contests.

• English
• Freemium
• Beginner

Verified 2026-07-09

By Codeforces

The competitive-programming arena where serious contest ratings are earned.

• English
• Free
• Advanced

Verified 2026-07-09

By InterviewBit (Scaler)

Gamified interview prep with free mock interviews; great for the final two months.

• English
• Free
• Intermediate

Verified 2026-07-09

By Naukri (formerly Coding Ninjas Studio)

Free guided practice paths with interview experiences attached.

• English
• Free
• Beginner

Verified 2026-07-09

By HackerEarth

Hiring challenges and hackathons that double as practice and job leads.

• English
• Free
• Intermediate

Verified 2026-07-09

By Antti Laaksonen

The canonical topic-by-topic drills for algorithmic mastery.

• English
• Free
• Advanced

Stretch tier. Pairs with the author's free Competitive Programmer's Handbook PDF.

Verified 2026-07-09

By Scott Chacon & Ben Straub

The free official Git book; everything from basics to internals.

• English
• Free
• All levels

Verified 2026-07-09

By Kunal Kushwaha - WeMakeDevs

Learn working Git in one sitting; the one-shot video everyone recommends.

• English
• Free
• Beginner

Verified 2026-07-09

By SQLBolt

Interactive SQL lessons; the best first step of the free SQL pipeline.

• English
• Free
• Beginner

Free SQL pipeline: SQLBolt, then SQLZoo, then LeetCode Database problems.

Verified 2026-07-09

By SQLZoo

Step two of the free SQL pipeline; broader query practice with instant feedback.

• English
• Free
• Beginner

Verified 2026-07-09

By LeetCode

Interview-grade SQL problems; the final step of the free SQL pipeline.

• English
• Freemium
• Intermediate

Verified 2026-07-09

By StrataScratch

Real questions asked by real companies, for SQL and data roles.

• English
• Freemium
• Intermediate

Free paths cover a good slice; the full question bank is paid.

Verified 2026-07-09

By Linux Journey (maintained by LabEx)

A friendly guided path through Linux fundamentals.

• English
• Free
• Beginner

Now maintained by LabEx at linuxjourney.org.

Verified 2026-07-09

By Cormen, Leiserson, Rivest & Stein - MIT Press

The algorithms reference; open it when you need the full rigorous story.

• English
• Paid
• Advanced

Low-cost Indian editions are available.

Verified 2026-07-09

By Gayle Laakmann McDowell

The interview classic, refreshed by the 2025 Beyond CTCI follow-up.

• English
• Paid
• Intermediate

Verified 2026-07-09

By Antti Laaksonen

A free PDF that covers competitive programming end to end; pairs with the CSES Problem Set.

• English
• Free
• Advanced

Verified 2026-07-09