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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.

IntermediateInteractiveEnglish▲ 9 votes

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