From Nookipedia, the Animal Crossing wiki
This article is all about using categories on Nookipedia. It will teach you how to add categories, and how to implement them into various articles.
What is a category?
A category is a page grouping similar articles together. They are grouped alphabetically and can contain an unlimited amount of sub-categories. Site-related articles use them a lot; for example, this article is in the Category:Help. Categories are displayed at the bottom of the page. Occasionally, a certain template can automatically put the article in a certain category.
Creating a category
Categories can be created just like any other page on the wiki. After you have determined an appropriate name for a category name and know its parent category, you can go to the un-created category page (e.g.: Category:New category name), and create the category as you would any other page by placing content into the edit box and clicking the "Save page" button. Category pages should have a short description of what the category contains and should also be placed in any relevant parent categories (which can be done per the instructions in the next section).
Unnecessary or duplicate categories will be deleted.
Adding an article to a category
To add an article to a category, add
If you want to simply link the category without adding the page to the category, which you may want to do in talk page discussions, add a colon before "Category". So, using the NAME OF CATEGORY example, you would type the link as this: [[:Category:NAME OF CATEGORY]].
Alternatively, registered users can use HotCat to easily manage categories.