First, go to 'Courses' > 'Categories'.

Click 'Add Categories'

Enter the 'Category Name', for example, "Marketing," and append the 'Category URL' prefix at the end, in this case, "marketing". Click 'Add Category'.

Our first category that we've just created, named "Marketing", is shown. Currently, the total number of courses being displayed is 0, as none have been added yet.

To delete this category, just click 'Delete' icon.