If I could recommend just one resource to every web security student, it would be the OWASP Top 10. Updated by a global community of security professionals, this document ranks the most critical web application security risks and underpins many industry standards and security audit requirements.
Something I emphasize in my courses: the goal of the OWASP Top 10 isn't memorizing vulnerability names — it's understanding why these mistakes happen and how to prevent them at the design stage.
The official, always up-to-date source:
OWASP Top 10 (Official): https://owasp.org/Top10/2025/
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What Is the OWASP Top 10 and Why Every Web Developer Should Know It
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