Resources
CTF Sites
OverTheWire
Series of games that teach security with practical challenges.
TryHackMe
Learn and practice hacking skills in a safe, gamified environment.
picoCTF
Engaging CTF-style challenges, making learning fun and practical.
Ring Zer0 CTF
A wide variety of different challenges for all skill levels.
HackTheBox
Hands-on challenges from fundamentals to advanced.
CTFtime
Index of public CTF challenges.
Learning/Tools
Hacktricks
Collection of in-depth tutorials on various exploits.
Hacker101
Free online course for ethical hacking and security fundamentals.
Hitchhiker's Guide
An introduction to various online tracking techniques.
CTF 101
CTF Tutorial for absolute beginners.
Cyberchef
A web app for encryption, encoding, compression, and data analysis.
SecTools
Curated list of security tools across different categories.