Hi Ruiseart, If you want to stock up on D&D 5e books the best ones are: Player's Handbook : contains most of the rules, races, etc. Note: much of this content is in the SRD (and thus the free compendium) but not everything. Dungeon Master's Guide : contains the rules and magic items your DM will need. Note: again, some of this content is in the SRD (and thus the free compendium) but not everything. Monster Manual : Contains all the monsters. Probably the single best purchase. Note: again, some of this content is in the SRD (and thus the free compendium) but not everything, especially not the artwork. Tasha's Cauldron of Everything : Contains many options for classes, more spells, etc. Also contains the class Artificer. Xanathar's Guide to Everything : Contains more things like spells etc. But the thing I like most about it are the expansion on various rules such as the downtime rules. Monsters of the Multiverse: MANY more race options. If you want your group to have a wide variety of races, this is a definite resource. Additionally, has a lot of monsters to add to the monsters your DM has access to. This is the basic list of books I typically recommend. After that you start getting into specifics, such as setting books. For those I'd ask your DM what they might want and allow. Many setting books contain more race options etc.
