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6 resources

IntermediateBookEnglish & French▲ 33 votes

From fundamentals to advanced topics like closures, prototypes and the event loop — the reference free JavaScript book, kept current.

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

IntermediateBookEnglish▲ 26 votes

The official Rust book: ownership, borrowing, traits and fearless concurrency, free online with runnable examples.

IntermediateBookEnglish & French▲ 25 votes

The complete Git reference book, free online, with a maintained French translation — from first commit to plumbing internals.

IntermediateInteractiveEnglish▲ 24 votes

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

IntermediateInteractiveEnglish▲ 9 votes

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