Categories
From Retardpedia, the only wiki
This page helps to understand categories
Categories are intended to group together pages on similar subjects.
Categories are normally found at the bottom of an article page. Clicking a category name brings up a category page listing the articles (or other pages) that have been added to that particular category. There may also be a section listing the subcategories of that category. The subcategorization feature makes it possible to organize categories into tree-like structures to aid navigation.
The term category does refer to both the title of a category page—the category pagename—and the category itself.
Summary
The tables of categories, to which any editable page can be added. To add a page to a category, change the href in that page's html at the bottom. The categories to which a page belongs appear in a box at the bottom of the page.

Working with category pages
The following subsections are ordered from simple actions to more elaborate or rarer actions.
Linking to category pages
The following subsections are ordered from simple actions to more elaborate or rarer actions.
Why might a category list not be up to date?
Sometimes it takes time cause mr. Sneke-san haven't made it automatic its kinda scuffed. Yikes!