Again a great box by @egre55
Foothold:
The initial foothold is right is front of you read everything use c**l or browser PROPERLY later try reading a lot of documentations.
User:
Focus on something which seems obvious and useless but use the information to abuse admin’s Lazy Configuration tactics.
Root:
This one will be pretty straightforward with basic enumeration tools try Ls or Lm you will exploit it faster than user managed to do it in an hour.
Overall everything about this box will teach you how to deploy tools.
Kudos to @TazWake for nudges and comments here.