IntermediateInteractiveEnglish▲ 27 votes
PortSwigger Web Security Academy
Free, hands-on labs covering the whole of web security — XSS, SQL injection, auth flaws — from the makers of Burp Suite.
4 resources
Free, hands-on labs covering the whole of web security — XSS, SQL injection, auth flaws — from the makers of Burp Suite.
Practice 70+ programming languages with small exercises and free human mentoring from volunteers.
Google's course collection on modern web development: CSS, accessibility, performance, forms and PWA, written by platform experts.
Apple's official interactive SwiftUI tutorials: build real iOS interfaces step by step in Xcode.