Learn everything about CSE

Real Python ↗In-depth tutorials, articles, and courses for all Python levels

LearnPython.org ↗Free interactive Python tutorial with in-browser exercises

Codecademy Python 3 ↗Interactive Python 3 course with hands-on coding environment

interactivecert

CS50P — Harvard ↗Harvard's free Introduction to Programming with Python

Automate the Boring Stuff ↗Practical Python programming for total beginners — free book

The Modern JavaScript Tutorial ↗Comprehensive JS guide from basics to advanced — highly recommended

⚡ JavaScriptWeb Essential

MDN JavaScript Guide ↗Mozilla's authoritative JavaScript reference and guide

Eloquent JavaScript ↗A modern introduction to JavaScript — free online book

freeCodeCamp JS ↗300-hour JS curriculum with algorithms and data structures cert

TypeScript Docs ↗Official TypeScript handbook and reference documentation

☕ JavaOOP Classic

Oracle Java Tutorials ↗Official Java SE tutorials from Oracle — comprehensive and thorough

Codecademy Java ↗Interactive Java course covering OOP, data structures, and more

GeeksforGeeks Java ↗Extensive Java tutorials, examples, and interview questions

JetBrains Academy Java ↗Project-based Java learning from JetBrains — build real apps

interactivepractice

⚙️ C / C++Systems Power

LearnCpp.com ↗Free, thorough C++ tutorial site — considered the best free resource

cppreference.com ↗The definitive C and C++ reference documentation

CS50x — Harvard ↗Harvard's intro CS course — starts with C, moves to Python and SQL

GFG C++ ↗Comprehensive C++ tutorials covering STL, OOP, and competitive programming

🦀 RustSystems Modern

The Rust Book ↗Official Rust programming language book — free online

Rustlings ↗Small exercises to get used to reading and writing Rust code

Tour of Rust ↗Step by step guide through Rust programming language features

🐹 Go / GolangCloud Native

A Tour of Go ↗Official interactive tour of the Go programming language

Go by Example ↗Hands-on introduction to Go using annotated example programs

Boot.dev Go Course ↗Backend-focused Go course with interactive exercises

🍎 Swift / KotlinMobile Native

The Swift Programming Language ↗Official Apple Swift language reference — free

SwiftUI Tutorials — Apple ↗Official SwiftUI tutorials from Apple for building iOS apps

Kotlin Docs — JetBrains ↗Official Kotlin documentation and getting-started guide

Android Kotlin Guide ↗Official Android development guide using Kotlin

🔢

Data Structures & Algorithms // core foundation

▾

📚 Learn DSA Theory

GeeksforGeeks DSA ↗The most comprehensive free DSA resource — arrays to graphs and beyond

W3Schools DSA ↗Beginner-friendly DSA with interactive animations and examples

Programiz DSA ↗Clear explanations of DSA with code in multiple languages

CP-Algorithms ↗Comprehensive algorithms reference — from basic to advanced competitive programming

Coursera DSA Specialization ↗UC San Diego's 6-course DSA specialization — university level

MIT 6.006 Algorithms ↗MIT OpenCourseWare — Intro to Algorithms, free lecture videos & notes

🎯 Practice & Interview Prep

LeetCode ↗The #1 platform for coding interview practice — 3000+ problems

practiceinteractive

HackerRank Algorithms ↗Algorithm challenges with structured difficulty progression

NeetCode ↗Curated LeetCode problems with video solutions — structured roadmap

AlgoMonster ↗Pattern-based DSA learning to crack coding interviews efficiently

InterviewBit ↗Topic-wise DSA practice with company-specific problem sets

BinarySearch ↗Collaborative coding problem platform with real-time sessions

🌀 Visualizations

VisuAlgo ↗Visualize data structures and algorithms through step-by-step animation

USFCA Data Structure Visualizations ↗Interactive visualizations for many data structures and algorithms

Algorithm Visualizer ↗Interactive platform for visualizing algorithms from code

🌐

Web Development // frontend · backend · fullstack

▾

🎨 HTML & CSS

MDN HTML Docs ↗The authoritative HTML reference by Mozilla — bookmark this

MDN CSS Docs ↗Comprehensive CSS reference and guides from Mozilla

W3Schools HTML/CSS ↗Easy to follow tutorials for HTML and CSS with live code editors

CSS-Tricks ↗Deep dives into CSS techniques, flexbox, grid, and modern CSS

CSS Grid Garden ↗Game to learn CSS Grid layout — 28 interactive levels

Flexbox Froggy ↗Learn CSS flexbox through a fun game — 24 levels

⚛️ React / Next.js

React Official Docs ↗The new official React documentation — interactive and comprehensive

freedocsinteractive

Next.js Learn ↗Official Next.js learning course — build a full-stack app from scratch

Scrimba React Course ↗Interactive React course with challenges embedded in video tutorials

Epic React — Kent C. Dodds ↗Advanced React workshops — patterns, performance, and testing

🌿 Vue / Svelte / Angular

Vue.js Official Guide ↗Official Vue 3 documentation with interactive playground

Svelte Tutorial ↗Official interactive Svelte tutorial — learn in the browser

Angular Tutorials ↗Official Angular learning path from basics to advanced patterns

🟩 Node.js / Express / APIsBackend

Node.js Official Learn ↗Official Node.js learning guide for beginners and advanced devs

Express.js Guide ↗Official Express.js routing, middleware, and API building guide

FastAPI Tutorial ↗Official FastAPI tutorial — build high-performance Python APIs

REST API Tutorial ↗Learn RESTful API design principles and best practices

🎒 Full-Stack Curricula

The Odin Project ↗Free, open-source full-stack curriculum — one of the best free paths

freeCodeCamp ↗3000+ hours of free coding curriculum with certifications

Full Stack Open — Helsinki ↗University of Helsinki's deep dive into modern web development

Codecademy Web Dev ↗Structured web development paths from HTML to full-stack

interactivecert

🗄️

Databases // SQL · NoSQL · ORMs

▾

📋 SQL Fundamentals

W3Schools SQL ↗Learn SQL syntax from scratch with interactive examples

SQLZoo ↗Interactive SQL tutorials with real databases and exercises

Mode SQL Tutorial ↗SQL for data analysis — basic to advanced analytical queries

Select Star SQL ↗Interactive book to learn SQL — data journalism focused

PostgreSQL Exercises ↗Practical PostgreSQL exercises with real club database

🍃 NoSQL / MongoDB

MongoDB University ↗Free official MongoDB courses — from basics to aggregation and Atlas

Redis Learn ↗Official Redis learning resources — caching, pub/sub, and data structures

CockroachDB University ↗Free courses on distributed SQL databases

🏗️ Database Design

GFG DBMS ↗Database management systems — normalization, ER diagrams, transactions

Use The Index, Luke! ↗Free book on SQL indexing and performance optimization

Prisma Data Guide ↗In-depth guides on databases, data modeling, and SQL

ML Specialization — Andrew Ng ↗The legendary ML course by Andrew Ng — best starting point for ML

🤖

Machine Learning & AI // ML · DL · NLP · LLMs

▾

🎓 Foundational ML Courses

freecertvideo

Google ML Crash Course ↗Free ML course from Google with TensorFlow — interactive exercises

fast.ai — Practical Deep Learning ↗Top-down practical deep learning — build things first, theory later

DeepLearning.AI ↗Andrew Ng's platform — specializations in DL, NLP, MLOps, and more

Deep Learning Book — Goodfellow ↗The canonical deep learning textbook — free online by Goodfellow et al.

🔬 Frameworks & Libraries

PyTorch Tutorials ↗Official PyTorch tutorials — the framework of choice for research

TensorFlow Tutorials ↗Official TensorFlow guides for building and training ML models

Scikit-learn Tutorials ↗Python's most popular ML library — official tutorials and user guide

Hugging Face Learn ↗Free courses on NLP, diffusion models, and RL with Transformers

🧠 LLMs & Generative AI

DeepLearning.AI Short Courses ↗Free 1-hour courses on LLMs, RAG, agents, and prompt engineering

LLM Course — Hugging Face ↗Comprehensive course on building and deploying large language models

Prompt Engineering Guide ↗Comprehensive guide to prompt engineering techniques for LLMs

Neural Networks — Karpathy ↗Andrej Karpathy's zero-to-hero neural network series — best in class

🏆 Practice & Competitions

Kaggle Learn ↗Free micro-courses on ML, Python, SQL, and data science

freeinteractivecert

Kaggle Competitions ↗Real-world ML competitions with prize money and community notebooks

practice

📊

Data Science & Analytics // stats · viz · pandas

▾

🐼 Python Data Stack

Pandas Getting Started ↗Official pandas tutorials for data manipulation and analysis

NumPy Learning ↗Official NumPy tutorials and absolute beginner's guide

Matplotlib Tutorials ↗Official Matplotlib plotting library tutorials

Seaborn Tutorial ↗Statistical data visualization with Python — official tutorial

📈 Statistics & Probability

Khan Academy Statistics ↗Free statistics and probability course — beginner to advanced

Seeing Theory — Brown Univ. ↗Visual introduction to probability and statistics — beautiful animations

Introduction to Statistical Learning ↗Free textbook — ISLP with Python edition — essential for data science

🖥️ Platforms & Courses

DataCamp Data Science Track ↗Structured Python data science career track with projects

interactivecert

IBM Data Science — Coursera ↗IBM's 12-course professional certificate in data science

Open Source Data Science Masters ↗Free curated curriculum for learning data science from scratch

🔐

Cybersecurity // ethical hacking · cryptography · defense

▾

🛡️ Fundamentals & Certifications

Cybrary ↗Free cybersecurity courses and cert prep — CompTIA, CEH, CISSP

Google Cybersecurity Cert ↗Google's professional cybersecurity certificate on Coursera

CompTIA Security+ Resources ↗Official CompTIA resources for Security+ certification preparation

PortSwigger Web Security Academy ↗Free web security training — XSS, SQLi, CSRF, and more — lab-based

⚔️ Ethical Hacking & CTF

TryHackMe ↗Learn cybersecurity through hands-on virtual labs and CTF challenges

interactivepractice

Hack The Box ↗Advanced penetration testing labs and CTF challenges

practiceinteractive

picoCTF ↗Beginner-friendly CTF competition by Carnegie Mellon University

OverTheWire Wargames ↗Security wargames to learn and practice security concepts via challenges

🔑 Cryptography & Secure Coding

The Cryptopals Challenges ↗Practical cryptography exercises by Matasano — hands-on learning

OWASP Top 10 ↗The most critical web application security risks — essential reference

Cryptography I — Stanford ↗Stanford's cryptography course on Coursera — Dan Boneh

☁️

Cloud Computing // AWS · Azure · GCP

▾

🟠 Amazon Web Services (AWS)

AWS Skill Builder ↗Official AWS digital training — hundreds of free courses and labs

AWS Fundamentals — Coursera ↗AWS going cloud native specialization for developers

AWS Cloud Practitioner — Udemy ↗Stéphane Maarek's top-rated AWS CLF-C02 prep course

videocert

🔵 Microsoft Azure

Microsoft Learn — Azure ↗Free official Azure learning paths and sandboxes from Microsoft

freeinteractivecert

AZ-900 Specialization — Coursera ↗Microsoft's official Azure Fundamentals certification prep

🟡 Google Cloud Platform

Google Cloud Skills Boost ↗Official Google Cloud learning paths with Qwiklabs hands-on labs

freeinteractivecert

GCP Training ↗Google Cloud's official training courses and certification paths

🖧

Systems: OS, Networks & Architecture // low-level foundations

▾

🧰 Operating Systems

OSTEP — Free OS Textbook ↗Operating Systems: Three Easy Pieces — the best free OS textbook

GFG Operating Systems ↗Comprehensive OS tutorials — scheduling, memory, file systems

MIT 6.828 OS Engineering ↗MIT's OS course with JOS kernel labs — for serious systems learners

Beej's Guide to Network Programming ↗Classic free guide to socket programming in C — clear and practical

🌐 Computer Networks

GFG Computer Networks ↗OSI model, TCP/IP, routing, DNS, HTTP and all networking fundamentals

Neso Academy ↗YouTube channel — excellent free lectures on OS, Networks, and DBMS

Cisco Networking Academy ↗Free networking courses from Cisco — CCNA prep and more

⚡ Computer Architecture

Nand2Tetris ↗Build a modern computer from first principles — gates to OS

MIT 6.004 — Computation Structures ↗Digital circuits, combinational logic, and computer architecture from MIT

CS:APP — CMU ↗Computer Systems: A Programmer's Perspective — essential CMU textbook

SwiftUI Tutorials — Apple ↗Official interactive Apple tutorials for building iOS apps with SwiftUI

📱

Mobile Development // iOS · Android · Cross-platform

▾

🍎 iOS / Swift

Hacking with Swift ↗Hundreds of free Swift tutorials — 100 Days of SwiftUI is excellent

Stanford CS193p — iOS Dev ↗Stanford's free iOS development course using SwiftUI

Android Developer Courses ↗Official Google-made Android dev training — Kotlin and Jetpack Compose

🤖 Android / Kotlin

Android Dev with Kotlin — Udacity ↗Google-collaborated Android Kotlin course by Udacity

🦋 Flutter / React Native

Flutter — Learn ↗Official Flutter learning resources, codelabs, and documentation

Flutter Codelabs ↗Hands-on Flutter codelabs — build your first Flutter app step by step

React Native Docs ↗Official React Native documentation and getting started guide

React Native Express ↗Comprehensive interactive guide to React Native development

⚙️

DevOps & Infrastructure // Docker · K8s · CI/CD

▾

🐳 Docker & Containers

Docker Get Started ↗Official Docker tutorial — containerize your first app step by step

Play with Docker ↗Free Docker playground in the browser — no install needed

☸️ Kubernetes

Kubernetes Tutorials ↗Official Kubernetes tutorials — deploying apps and interactive lessons

freeinteractivedocs

Killercoda Kubernetes ↗Free browser-based Kubernetes interactive scenarios and labs

🔄 CI/CD & IaC

GitHub Actions Docs ↗Learn GitHub Actions CI/CD workflows from the official documentation

Terraform Tutorials — HashiCorp ↗Official Terraform tutorials for Infrastructure as Code

DevOps Roadmap ↗Community-driven DevOps learning roadmap — know what to learn next

Linux Journey ↗Free guided Linux learning — from basics to system admin

🏗️

Software Engineering // design · patterns · system design

▾

📐 System Design

System Design Primer ↗GitHub's most-starred system design resource — 250k+ stars

Grokking System Design — Educative ↗Popular system design interview prep course with real-world examples

ByteByteGo ↗System design explained with beautiful visuals by Alex Xu

video

High Scalability ↗Real-world architecture case studies — how big companies scale

Refactoring.Guru — Design Patterns ↗Design patterns explained with real-world analogies and code examples

🎨 Design Patterns

Patterns.dev ↗Modern JavaScript design patterns for web apps — free online book

SourceMaking ↗Classic GoF patterns, anti-patterns, and refactoring guides

🔧 Version Control & Tooling

Pro Git Book ↗The definitive free Git book — everything about version control

Learn Git Branching ↗Interactive visual Git tutorial — branches, rebasing, merging

Conventional Commits ↗A specification for adding human and machine readable meaning to commits

MIT 6.042J — Math for CS ↗MIT's Mathematics for Computer Science — logic, proofs, combinatorics

∑

Mathematics for Computer Science // discrete math · linear algebra · calculus

▾

📐 Discrete Mathematics

Khan Academy CS Math ↗Algorithms, cryptography, and information theory from Khan Academy

3Blue1Brown — Essence of Linear Algebra ↗Beautiful visual intuition for linear algebra — Grant Sanderson's masterpiece

🔢 Linear Algebra

MIT 18.06 — Linear Algebra ↗Gilbert Strang's legendary linear algebra lectures from MIT OpenCourseWare

Khan Academy Linear Algebra ↗Khan Academy's free linear algebra course — vectors to eigenvalues

📈 Calculus & Probability

3Blue1Brown — Essence of Calculus ↗Visual calculus series — intuitions before formulas

Brilliant.org ↗Engaging interactive courses on math, science, and CS — problem-solving focus

Khan Academy Calculus ↗Complete free calculus curriculum — limits to integrals

🏆

Competitive Programming // contests · olympiads

▾

🏁 Competition Platforms

Codeforces ↗The most active competitive programming platform — rated contests

AtCoder ↗High-quality competitive programming contests from Japan

CodeChef ↗Monthly contests, practice problems, and tutorials for CP

CSES Problem Set ↗300 curated CP problems — excellent for building fundamentals

SPOJ ↗Classic competitive programming judge with thousands of problems

📘 Learning Resources

USACO Guide ↗Structured guide for USACO and competitive programming — bronze to platinum

CP-Algorithms ↗Comprehensive algorithms reference for competitive programming

How to Start CP — Codeforces Blog ↗Community guide on how to start competitive programming effectively

🎯

Career & Interview Prep // jobs · interviews · portfolio

▾

💼 Interview Preparation

LeetCode ↗The standard for coding interview practice — essential for FAANG prep

practiceinteractive

Pramp ↗Free peer-to-peer mock technical interviews — practice in real format

interviewing.io ↗Anonymous mock interviews with FAANG engineers — record and review

practice

Tech Interview Handbook ↗Free, curated content for technical interviews — from resume to offer

🗺️ Learning Roadmaps

Roadmap.sh ↗Community-driven developer roadmaps for every specialization

OSSU — Open Source CS Degree ↗Free self-taught path to a world-class CS education — curated by community

Teach Yourself CS ↗Curated recommendations for self-taught software engineers — excellent