Comment by smallerdemon

Honestly, if you want to do this, just study and use the Library of Congress cataloging system: https://catalog.loc.gov/vwebv/ui/en_US/htdocs/help/numbers.h...

The energy in creating your own catalog system to this extent while one already exists seems pretty ridiculous.

Why not Dewey Decimal? Well... I mean... I guess you could. But most libraries have converted to LOC since it is fully supported and still receives attention and updates to categorizations.