Zettelkasten/Glossary
From charlesreid1
Categories vs Tags
MediaWiki categories are used the way Zettelkasten tags are used. Many Zettelkasten guides will distinguish between categories and tags, but in MediaWiki the two are basically equivalent (close enough). Notes can have multiple categories, category pages automatically create a list of all notes with those categories, and it's all built into MediaWiki.
Category Pages vs Topic Pages
If making a page about a topic like Python, do you create a Python page, and add the information there? or do you create a Category:Python page with the information, which will also include an automatically assembled list of all pages with that category applied?
Answer: 99% of the time, put information into the topic page (Python) and NOT the category page (Category:Python).
Category pages should be limited to short sentences (like Main Page: [[Python]], and should themselves be tagged with any parent categories (example: Category:Numpy might be tagged with Category:Python and Category:Math).
Category pages should also include any relevant Flag templates. Flags can be thought of as mini, organized, insertable category pages, so putting them on the actual Category pages makes sense.