BeginnerCourseEnglish▲ 40 votes
Harvard CS50x: Introduction to Computer Science
Harvard's legendary intro to computer science: C, Python, SQL, algorithms and web development, free for everyone.
Browse resources
20 resources
BeginnerCourseEnglish▲ 38 votes
The Odin Project
A full open-source curriculum for becoming a web developer: HTML, CSS, JavaScript, Node.js and Ruby paths with real projects throughout.
BeginnerInteractiveEnglish & French▲ 35 votes
freeCodeCamp Curriculum
Thousands of hours of interactive lessons and certification projects covering web development, JavaScript, data analysis and more.
IntermediateInteractiveEnglish▲ 27 votes
PortSwigger Web Security Academy
Free, hands-on labs covering the whole of web security — XSS, SQL injection, auth flaws — from the makers of Burp Suite.
IntermediateInteractiveEnglish▲ 24 votes
Exercism
Practice 70+ programming languages with small exercises and free human mentoring from volunteers.
AdvancedInteractiveEnglish & French▲ 23 votes
Root Me: Hacking & Security Challenges (French)
500+ security challenges with strong French-language coverage: web, crypto, forensics, networking. A francophone security-training reference.
BeginnerInteractiveEnglish & French▲ 22 votes
Learn Git Branching
A visual, interactive playground for mastering branches, rebases and remotes — fully translated into French.
BeginnerInteractiveEnglish & French▲ 21 votes
Flexbox Froggy
Learn CSS flexbox by guiding a frog to its lily pad through 24 short interactive puzzles.
BeginnerInteractiveEnglish▲ 20 votes
SQLBolt
Interactive SQL lessons and exercises that run in the browser — the fastest path from zero to confident SELECTs and JOINs.
IntermediateCourseEnglish▲ 19 votes
web.dev Learn
Google's course collection on modern web development: CSS, accessibility, performance, forms and PWA, written by platform experts.
BeginnerArticleFrench▲ 18 votes
Zeste de Savoir: Computing Library (French)
Community-written, peer-reviewed French tutorials and courses on programming, systems and networking. Run by a non-profit.
BeginnerCourseEnglish▲ 17 votes
Kaggle Learn
Short, hands-on micro-courses on Python, pandas, SQL and machine learning with in-browser notebooks.
IntermediateInteractiveFrench▲ 16 votes
France-IOI: Programming & Algorithmics (French)
Progressive French-language algorithmics and programming tracks with an automated judge. Also trains for programming olympiads.
AdvancedCourseEnglish▲ 15 votes
fast.ai: Practical Deep Learning for Coders
The famous top-down deep learning course: build working models first, understand the theory as you go.
BeginnerCourseEnglish▲ 14 votes
Linux Journey
A gentle, well-sequenced free course on Linux: the shell, processes, permissions, networking and packages.
AdvancedArticleEnglish▲ 13 votes
Teach Yourself Computer Science
An opinionated map of the nine CS subjects that matter and the single best free resource for each.
IntermediateCourseFrench▲ 12 votes
OpenClassrooms: Administer a Linux System (French)
A complete French Linux administration course: users, permissions, services, monitoring. Free to read.
BeginnerArticleEnglish & French▲ 12 votes
Open Source Guides
GitHub's guides on contributing to and maintaining open source projects, available in French.
BeginnerCourseEnglish▲ 11 votes
Android Developer Courses
Google's official free training for Android: Kotlin, Compose and app architecture, from first app to advanced.
IntermediateInteractiveEnglish▲ 9 votes
SwiftUI Tutorials
Apple's official interactive SwiftUI tutorials: build real iOS interfaces step by step in Xcode.