When I mention site architecture during the e-commerce store training I am simply referring to the way a website is structured. For example, how does the category structure work? Do you have products within categories, or products within sub-categories & sub-categories within categories? Site architecture also refers to the location of your support pages & content pages (i.e. articles & reviews).

If you use Zulu Cart to run your ecommerce store you really don't need to concern yourself with site architecture. By simply using the product input areas and setting up your store in the Zulu Cart admin area you are building your web store with sound architecture.