Add a product
Create product categories
Click Store>>Add product to open a window in which you can enter the product page name.
There is the option of turning a product into a category by checking the box "Set as category".
In addition, you can set where you want the page to be located, be it the top menu, side menu or not in any menu.
The added product can be seen by clicking Pages>>Page location (top menu/side menu/not on menus)
The store categories can be identified by the shopping cart icon at the side of the categories.
Under the category created, you can create additional categories by clicking the category>>Add to category>>enter product name.
Creating a product page
Under each category, you can add a product by clicking the category>>Add to category>>enter product name. In this case you don't have to check the checkbox.
When products exist under a certain category, you can see the + sign at the side of that category.