I would have the top level tag “Rulebook” and put “Core Rulebook” as a sub-tag. Under Rulebook also have “Player Handbook”, “GM handbook” and “Splatbook”. Keep the rules together.
Also tags for your dominant systems (ex DnD, PbtA) including “System Agnostic”. Perhaps add subtags “Pre-made” and “Generators” under “Setting”. Publisher tags? Language? Decade/year of release? Have played?
As long as the Russian bear is around to scare the west and occupy our mibds the Chinese dragon is at much more liberty to do whatever they want.