Schools
Online cybersecurity schools and games
Hands-on practice
Hack the box
Hack The Box: tons of machines with walkthroughs to practice. Hack The Box Academy: quality theory courses with practice lessons. For beginners better to start on Academy since machines can be too difficult at first.
Over The Wire
Free wargames CTF-like to learn Linux and bash
Under The Wire
Free wargames CTF-like, inspired on OverTheWire but using Powershell
TryHackMe
Online school with CTF labs and academy modules
Linux Journey
Learn Linux with exercises.
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