A category corresponds to a page in our store catalog. When there are at least two categories in the shop, or we have at least one product in the Showcase, the user will see the category selection menu.

By default we find one called "Main", of which we can change the name and/or priority. The priority of a category corresponds to its level of importance compared to the others. In fact, the higher the priority, the sooner the category will appear in the selection menu.
Additionally, if there is no Showcase, the highest priority category will be the front page of our store.