As you readed SpmodAPI is a gag mod.
I seperate it into these things.
Dekoration Blocks: Everything where you want to create things that look nice there you have it
Gas&Animals: Simply Entities come into place and you produce gas and stuff with it.
Hemp: Everything that has todo with Hemp. Decoration, Feeding of Animals, Plants and other Stuff.
Utilities: Utilitie blocks like a Cobble Bench, MobMachine, Exp Storage and other Stuff.
Armor: Everything that helps/protect you.
Crafting: Mostly Crafting Items so no really Extra use.
Exp Items: Store&Use your exp in any Way.
Gas: Everything what has todo with gas as items.
Hemp: Food, Utiliti Items which made/uses Hemp.
Trades: Something that has todo with Villagers.
So that covers most things. There will be more Categories. But that comes later