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7 resources

IntermediateDocumentationEnglish & French▲ 28 votes

The official interactive introduction to React: components, state, effects and thinking in React, with editable examples.

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.

IntermediateDocumentationEnglish▲ 22 votes

The official guide to TypeScript's type system, from everyday types to generics and declaration files.

IntermediateCourseEnglish▲ 19 votes

Google's course collection on modern web development: CSS, accessibility, performance, forms and PWA, written by platform experts.

IntermediateDocumentationEnglish▲ 16 votes

Concise, actionable secure-coding guidance for dozens of topics, maintained by the OWASP community.

IntermediateInteractiveEnglish▲ 9 votes

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