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11 resources

BeginnerInteractiveEnglish & French▲ 35 votes

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

BeginnerToolEnglish▲ 29 votes

Community-maintained visual roadmaps for frontend, backend, DevOps and 20+ other paths, with linked resources per step.

IntermediateInteractiveEnglish▲ 27 votes

Free, hands-on labs covering the whole of web security — XSS, SQL injection, auth flaws — from the makers of Burp Suite.

Security Web SecurityFree with limits: Requires a free account to track lab progress

IntermediateInteractiveEnglish▲ 24 votes

Practice 70+ programming languages with small exercises and free human mentoring from volunteers.

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.

AdvancedArticleEnglish▲ 13 votes

An opinionated map of the nine CS subjects that matter and the single best free resource for each.

BeginnerArticleEnglish & French▲ 12 votes

GitHub's guides on contributing to and maintaining open source projects, available in French.

IntermediateInteractiveEnglish▲ 9 votes

Apple's official interactive SwiftUI tutorials: build real iOS interfaces step by step in Xcode.