Categories are a feature of the wiki software that allows articles to be tagged with one or more keywords and indexed automatically or sorted. An article's categories appear at the bottom of the page. To browse all the categories, see Special:Categories or Category:Browse, this wiki's root category.
Adding an article
To add an article to a category, edit the page and add a link to the category at the bottom of the page, like this:
This: [[:Category:Tortall]], produces this: Category:Tortall.
To alter the indexing of an article within a category, add a pipeline character (|) and after it the proper sorting index. By default, articles are sorted by their full name. By convention, characters articles are sorted by the character's surname (or fief name) and then their first name, like this:
[[Category:Characters of Tortall|Mindelan, Keladry]]
To preview a category and make sure it's not a broken link, click the "Preview" button and scroll down to the bottom of the page, below the editing buttons and the list of transcluded templates. The categories will appear exactly as they would on a saved article. Make sure all category names are spelled correctly before saving.
Editing a category
You can edit a category exactly as you would edit an article. When editing, the tagged articles will not appear in the edit box, although they will appear on preview. Create a category as you would any page, by linking to it from an article or the sandbox, and then clicking the redlink to edit.
Category pages should have a brief explanation of their purpose, and be tagged with a super-category.
The super-category for all pages in this wiki is Category:Browse. Project namespace pages go under Category:Project. Help pages go under Category:Help. General templates go under Category:Templates, unless they're a specified type like navigation templates, infoboxes etc. in which case they belong in one of the sub-categories of Category:Templates. Forum pages are automatically indexed, as long as you follow the instructions for creating and editing them.
Pages of any kind can be added to more than one category, and if more than one category is suitable, they should be. The exception to this is nested categories; there's no need to add Rosethorn both to Category:Characters of Emelan and to Category:Emelan. When the character categories start becoming crowded, it will be time to consider sub-categories like Category:Gods of Tortall and Category:Dedicates of Winding Circle, and to decide what the policy is for tagging characters with them.
If none of the existing categories seem to fit the article you want to create, you can add whatever categoryyou see fit, and then bring it up for discussion at the watercooler.