By default, Cart template consists of 1 section: Cart page. This section cannot be removed, and can only be hidden on Cart template.
Aside from this section, you can freely add or remove any other sections on Cart template.
By default, the layout of Cart page follows the default settings on Shopify Cart page, which shows brief Product Details (including Product image, product name, product variant), Product Quantity, Product Price and SubTotal of the order, with a Call-To-Action button to Check Out page.
If there are no products on Cart page, there will be a notification “Your cart is empty” and a Call-To-Action button for Continue Shopping.
If there are discount products in the cart, there will be a subtotal price discount which let the customers know how much they get discounted in total.
If you integrate a third party app for selling plan, the information will be synced from there and displayed in the cart page as well.