ERPNext ecommerce Website module Backend

I’m a newbie to ERPNext. I working on an e-commerce module. I have a doubt about the backend functionalities of the e-commerce module. When I’m creating a record on UI. For example, If I create a product, the product record is not reflecting on the backend code but only to the database. I’m glad If you guide me with this. Other than UI How I can work on the backend to create a feature or do Customization.
Kindly clear my doubt. Thanks in advance.