Wikipedia:Tip of the day/August 10, 2006
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Let's say you have thought of a new category you want to place some articles in. To create this new category, go to one of the pages that you wish to put there, and add a category tag naming the new category to the end of the article, like this:
[[category:category name]]
...where in place of "category name" you type the actual name of the category. When you save the page, the category should appear on the bottom line of the page. If it is indeed a new category, it will turn up in red (meaning it doesn't exist yet). Click on the redlink, and then click on the article creation link provided in the instructions that appear on your screen.