Most of the actual cart work occurs here.
For some cart owners, it's a fix and forget situation. For others who take advantage of the extended features, it's the "happening" place.
Of course, it's all about managing categories and products.
From creating to featuring to sales, there are a nice variety of ways to manage products. One needs to investigate all of these even if you don't expect to do more than just create, edit, or delete products. You might be surprised at what you find.