Every Moodle course belongs to one course category. When a student selects a course, they must first select a category. In the next example, the student selected the Tracking and Animal Observation category from the Front Page, and is selecting a course from that category:

Notice that even though the student is looking at the Tracking and Animal Observation category, a drop-down list of Course categories enables the student to see the other categories. Typical of Moodle, this enables the student to jump to another part of the site without having to return to the Front Page.

Categories are a site-wide way to organize your courses. You can also create subcategories. The categories or subcategories become an online course catalog. Organize them in the same intuitive way you would a printed course catalog.