Rulebook for players and the GM

#Rules

IF YOU'RE A PLAYER

If you're a player, these are the only books you'll probably need.

And maybe:

IF YOU'RE A GM

Books not suggested by the genre guide but are probably essential:
From the GURPS Genre Guide

Note - PU1 is about imbuements so not relevant.

Recommended books:

Suggested books:

Recommended Pyramid articles:

Suggested Pyramid articles:

Non-GURPS:

Things that may be useful:
https://forums.sjgames.com/showthread.php?t=85061&page=5
This forum post adds commentary (seasong's posts all over the thread on all pages) - including how to build software that may change the hacking rules?
This breaks down gang common features from a real-world standpoint.