I have begun learning security skills on the TryHackMe website and have completed two rooms. In my opinion, it is the best site for acquiring and practicing security skills so far.
- Nmap Live Host Discovery
- Linux Process Analysis
And several years ago, my VPS is hacked, so I spent lots time to analysis problem, and fixed by analysis the process.
Nmap Live Host Discovery
https://tryhackme.com/r/room/nmap01
Linux Process Analysis
https://tryhackme.com/r/room/linuxprocessanalysis
nmap & Linux Process Analysis