As drupalero, you will see that this talk emphasizes basic concepts you must understand and learn to use it for e-commerce (if you want your own online-store) or if your customers need it, either selling a product or service; also note that you can sell subscriptions or memberships(basically this is electronic content).

Drupal, give us a powerful tool and sure for our operations online, so come with us and learn how use it! =D

Cheers.