Let's say you want to build a simple e-commerce application. Your shop should have the following structure:

Users that are looking for Products inside your shop that are organized into Categories. After they found the specified products they add them into carts and finally are placing Orders.

1. Download from here the modules used for this demo.
2. Unzip the contents of the zip you downloaded in your Module folder
3. Go to Clear modules cache administration section and click Reread modules
4. Go to http://YourUrl/demo-shop address to generate the sample records for the demo shop
5. Take a look at the administration section and the files from the Module folder