How is the FAQ reading organized?

Answer 1

Most categories have a number of other categories listed as subcategories. These are listed in a special section of the category page, which appears above the list of articles belonging to the category. Click on these subcategories to navigate through the category tree to find more specific groups of articles.

Similarly, you may want to navigate in the other direction, to find more general groups of articles ("parent categories"). These are listed in the box at the bottom of a category page, just as on a Wikipedia article page.