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TryHackMe

TryHackMe is a free online platform for learning cyber security, using hands-on exercises and labs, all through your browser!

FMHY

The largest collection of free stuff on the internet!.

HackTricks

trick/technique/whatever in CTFs, real life apps, and reading researches and news.

CyberChef

CyberChef is a simple, intuitive web app for carrying out all manner of "cyber" operations within a web browser.