One way to get usable and consistent categories for a Wikipedia article is Lift Wing: https://wikitech.wikimedia.org/wiki/Machine_Learning/LiftWin...

I once used it to create a "Wikipedia StumbleUpon": https://github.com/fpsvogel/wiki-stumble#demo

Here is the code related to Lift Wing: https://github.com/fpsvogel/wiki-stumble/blob/main/app/model...

Mentioning this in case you're looking for something as a basis for tags.

EDIT: Here is a list of all the categories from Lift Wing: https://github.com/fpsvogel/wiki-stumble/blob/main/app/model...