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Dewey Decimal, LCC, and keywords, either genre specific (Space Opera, LoTR) or subject matter specific (GDPR, Electric Universe) are the way I go.
Novels can get Dewey Decimal Numbers. I started cataloging the _Virgin River_ series, but ended up binge-reading them. (How much did Robyn Carr & Debbie Macomber collaborate --- Jack also pops in either _Cedar Cove_ or _Rose Harbor_. )
I don't use fiction or non-fiction tags.
They are utterly meaningless terms.
"Based on a true story". What was taken from that true-life scenario? A plot line and, maybe, a plot device.
"This is a work of fiction", except twenty years later it was used as the basis for an unsuccessful battle plan. In the book, the side that was attacked lost both that battle, and the war.
_The Defense of Duffer's Drift_ is a great example of where the fiction/non-fiction becomes absurd. Military strategy for the platoon leader. Six dreams, on how to prevent the Boers from overwhelming the platoon, and taking the drift. Anybody having to defend a natural landmark, who doesn't take the lessons within that book into account, has a good chance of losing that landmark.
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