We have quite a bit of the basics covered in our Documentation subcategories which may be worth a browse/search. Here’s the one for creating a category:
This guide describes how to create a category in Discourse.
Required user level: Administrator (or moderator if the moderators manage categories setting is enabled)
Categories are meant to hold a collection of topics that have similar subject matter. They include an abundance of configuration options you won’t find with the lighter-weight tagging feature .
By default, category creation is limited to admin users. Moderators can be given the ability to create c…