Content is currently under development for Product Archtypes. When complete you will see a list of all the different documentation sections here that you can go to. Archetypes are templates with tokens that are replaced to create and manage many different, but simular products, for example variations of a ti-shirt for different school teams. You will also be able to select these from the menu on top.
In the interim, many of the options, fields, and selection lists have context sensitive help that you can view by holding your mouse over the item.