TryHackMe
tryhackme.com
Learn offensive and defensive security through guided hands-on rooms.
Cybersecurity
Offensive and defensive security, certifications and hands-on hacking labs.
Cybersecurity
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More Cybersecurity, awaiting their first bid. Curated by Outbid to help new categories get started — these haven't placed a bid yet, so anyone can start the first.
- OWASPowasp.org
The reference for web application security: Top 10, cheat sheets, tools.
- Hack The Boxhackthebox.com
Hands-on penetration-testing labs and cyber training.
- OverTheWire Wargamesoverthewire.org
Free wargames that teach security concepts hands-on.
- Web Security Academyportswigger.net
PortSwigger's free, in-depth web application security training.
- picoCTFpicoctf.org
Carnegie Mellon's free capture-the-flag security learning platform.