Well, over on LibraryThing, I use the following collections:
Science Fiction & Fantasy
Role-playing Games
Crime Fiction
Media-related
Gaming-related
Classical Authors
Other Fiction
Comics & Graphic Novels
Cookery
Literature
Art
Non-Fiction
Maps & Travel
Books are assigned to a single collection (yes, there are some cross-genre works), and then get given at least 2 tags to narrow it down.
A format tag - audiobook, ebook, print
Then a genre tag; e.g. my Science Fiction & Fantasy collection has the following:
Alternate History (216)
Artesia (1)
Cyberpunk (39)
Drama (6)
Fantasy (1671)
Historical Fantasy (18)
Horror (37)
Humour (1)
Matter of Britain (1)
Military SF (107)
Occult (20)
Paranormal Romance (7)
Paul's (13)
RPG - Fudge (1)
RPG Fiction (5)
Science Fiction (903)
Steampunk (23)
Urban Fantasy (327)
Vampire (135)
Weird (173)
My Calibre tag scheme is broadly similar; my shelves (from my Kobo days) are equivalent to the LibraryThing collection, then the tags are the same.
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