I am very new at how all this works and there is so much I don't understand. I have created a free product that gives visitors the ability to signup and login. At that point I want them to see a list of other available products they can purchase. This is where I am stuck. I see a few options that might help but I am not quite sure how this works. It seems there is a difference in product categories, membership groups, and renewal groups? Can anyone explain to me how this works and how I go about doing this?