Testlab
Notes on techniques
Linux
Windows
Coding shells and exploits
TryHackMe rooms
Root-me app-script challenges
Not an exhaustive list of escalation methods, but does include some “edge-case” tactics that may be seen in CTF exercises and challenges.
To build experience with tree climbing and monkeying about.
Windows PrivEsc
Linux PrivEsc
Steel Mountain
Alfred
HackPark
Game Zone
Skynet
The Daily Bugle
Overpass 2 hacked
Relevant
Internal
Mr Robot