Great question! Oberlo is an app to help you source products to dropship. You can import products from two locations: Aliexpress and Oberlo Supply.
Those are the only two places you can source products to dropship from! If you'd like to use Aliexpress you just need the Oberlo Chrome Extension. For Oberlo Supply you can import directly from the app on the explore page.
Let us know if there was something specific you were looking for and we can help you track it down!