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11 resources

BeginnerCourseEnglish▲ 40 votes

Harvard's legendary intro to computer science: C, Python, SQL, algorithms and web development, free for everyone.

Computer Science Algorithms PythonFree with limits: Optional paid certificate; all content free

BeginnerCourseEnglish▲ 38 votes

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

Thousands of hours of interactive lessons and certification projects covering web development, JavaScript, data analysis and more.

AdvancedInteractiveEnglish & French▲ 23 votes

500+ security challenges with strong French-language coverage: web, crypto, forensics, networking. A francophone security-training reference.

Security Web Security LinuxFree with limits: Core challenges free; premium solutions optional

BeginnerInteractiveEnglish & French▲ 22 votes

A visual, interactive playground for mastering branches, rebases and remotes — fully translated into French.

BeginnerInteractiveEnglish & French▲ 21 votes

Learn CSS flexbox by guiding a frog to its lily pad through 24 short interactive puzzles.

BeginnerInteractiveEnglish▲ 20 votes

Interactive SQL lessons and exercises that run in the browser — the fastest path from zero to confident SELECTs and JOINs.

BeginnerCourseEnglish▲ 17 votes

Short, hands-on micro-courses on Python, pandas, SQL and machine learning with in-browser notebooks.

Data & Data Science Python Machine Learning SQLFree with limits: Requires a free Kaggle account

AdvancedCourseEnglish▲ 15 votes

The famous top-down deep learning course: build working models first, understand the theory as you go.

BeginnerCourseEnglish▲ 14 votes

A gentle, well-sequenced free course on Linux: the shell, processes, permissions, networking and packages.

BeginnerCourseEnglish▲ 11 votes

Google's official free training for Android: Kotlin, Compose and app architecture, from first app to advanced.