This is our top-level category. (Looking at it another way, it is our root 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 (eg location and subject-matter). A full list of existing categories can be found at Special:Categories.
To add a new category, just add [[category:categoryname]] to the article or existing category page (after checking whether any existing category is suitable).
This category has the following 10 subcategories, out of 10 total.
Pages in category "Browse"
This category contains only the following page.