First of all, all our category rules can be found at Tardis:Categorisation, so be sure to read those for useful information.
There are probably a few ways to create a category, but the simple way is this:
- Add the category to an appropriate page (this does not, however, create the category yet)
- Click on the link to the category, which will take you to the create page
- Add an appropriate category to the one you want to create, then publish. This creates the category.