A shopping cart is a crucial part of an eCommerce website.
It may also be one of the most challenging elements to develop for an online store. Customers can select products, consider their selections, revise them, add more products as needed, and finally purchase them using a shopping cart.
With nopCommerce, a shopping cart is already built-in.
Read the article that describes what the nopCommerce shopping cart is made of and how to customize it: https://www.nopcommerce.com/blog/custom-aspnet-shopping-cart-development