I wish I could come up with an easy to maintain categorization. I have about 20 categories I use. Standards like SciFi, Fantasy, Crime/Mystery, Action/Adventure, etc. I assign one category per book. Sometimes it is hard to pick this single category.
I often find that Action/Adventure overlaps with Thriller/Suspense. And then Crime/Mystery overlaps with Thriller/Suspense. Future Dystopia competes with Post-Apocalypse. And then, I have the category of Classics. Things like Treasure Island and Tom Sawyer go in there. But they could go into Action/Adventure just as easily if they were lesser well-known titles. I have a few categories that I don't even know what they are. Example: Steampunk. I bought a few books in this genre because I wanted to give it a try. I haven't read any of them yet. How do I decide if a book goes into Steampunk? Well, if it has a picture on the cover of someone wearing goggles, standing next to a boiler, on a blimp - it must be steampunk, whatever that is.
Basically, my categorizations, while well intentioned, are pretty useless for the most part.
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