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5 resources

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

AdvancedArticleEnglish▲ 13 votes

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

IntermediateInteractiveEnglish▲ 9 votes

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