This is our top-level category.
Ideally, every other category should be a subcategory of at least one other, and every article should be in at least one category; many will fit well into two. A full list of existing categories can be found at Special:Categories.
If you want to add a category, just type [[category:categoryname]] to the article or existing category page after checking whether any existing category is suitable. However, if you want a new category to be created, please post your suggestion first on any admin talk page or create a blog.