- Core rulebook is optional for 3.0
- Core rules are in general's handbook 2021, core rulebook is more for lore
- So, to play matched play games, you need a general's handbook for the matched play rules and latest version of points.
- Lastly, you'll need your factions battletome.
- Also, some rules can be found in the broken realms series for additional rules. I think the updates also come with the AoS app
, the warscrolls are free. And AoS 3.0 no longer uses battalions from 2.0 battletomes, they use core battalions, which you can find in the General's handbook.