Too Long; Didn't Read
Google recently published additional guidance for ecommerce site owners relating to navigation which can be found here. The navigation menus and process of an ecommerce store can be super important: allowing both users* and search engines* to understand the structure/hierarchy of your store, enabling them to find their way around the different categories, sections and product offerings. A poorly designed, slow, or confusing navigation system can lead to both lower sales** as well as worse indexing** in search engines.