Tip of the moment...
How to add an article to a category

Wikipedia has index pages called Categories, in which links to articles are provided based on category tags included in each article.

To add an article to a particular category, add [[Category:Category name]] to the article's text (preferably at the bottom). The assigned category should now show up at the bottom of the article, and a link to the page should show up on the indicated category page in Wikipedia's category system. If the category shows up as a blue link it is an active category; if the link shows up red then the category has yet to be created. Click on the red link to create the category page.

To add this auto-randomizing template to your user page, use {{totd-random}}
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