“How do I create categories for my items?”
You do not have to create categories in advance. Categories for your store are created dynamically based on the categories you assigned to each item. So if you create three items, and you give two of them the category “Toys”, and three of them the category “Tools”, then your store will contain two categories: Toys and Tools.
Each time you Add or Edit an item, you have the opportunity to create a new category, or to change the category an item is in to another existing category.
If you Delete an item, and it is the only item in a particular category, then that category will no longer appear in your store.