This is our top category - or looking at it another way it is the root category. Every other category and every article, template, and file should be in at least one category, and many of them fit well into two or more categories.
To add a new category to a page you can click the Category button at the bottom of the page and type in the name you'd like your category to be called.
A full list of existing categories can be found at Special:Categories.
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