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).
If two categories have overlapping subject-matter with each having some that's not in the other (eg Category:North America and Category:Latin America or Category:History of France and Category:History of Science), they can each include (in the text portion) a link to the other, but neither should be a subcategory of the other. We will use the Categorisation page for detailed reasons and recommendations, including ways of arranging articles and subcategories in other than strict alphabetical order.
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