To add a new category to a page you can click the Category button at the bottom of the page and type in the name you'd like your category to be called.
A full list of existing categories can be found at Special:Categories.
Pages in category "Browse"
“ This category lists stub articles on this wiki. A stub is a short article that can be expanded...
“ After the Technic Pack recently updated the recommended build to version 7.2, a lot of people...
“ This category may include pages and subcategories related to the active contributors to the...