Web security
Current with the OWASP Top 10 2025 (Injection moved to A05, most courses still teach the old ranking), with real sandboxed attack labs, not just theory.
Free interactive web security course in 14 lessons. OWASP Top 10 2025, SQL injection, XSS, CSRF, CORS, cookies, CSP. PHP, Go and JS examples with safe challenges. No signup.
Free, interactive, no signup: https://www.web-developpeur.com/en/learning/securite/
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