Thread:Shadowmoon122/@comment-8-20190620051533/@comment-8-20190708171800

Sorry for the slow reply, I was away at the weekend :)

It's tagging a page with a category that creates that category. So if there are pages that you put in category "people" then that category will exist and show on the categories list.

To add a category, edit the page and click the three bars on the right of the page (next to the "cancel" button). Then select "categories". Add the new category to the "Add a category" box, and click "Apply changes"

Let me know if you get stuck!