Shipping and Payment
These frequently are permanently set for most carts. The occasional changes can be hard to figure out especially to activate a secure credit card processor or PayPal Express. There are tutorials for a number of them at ZenCart.com
Sure there are the sub-total, tax, and total bits that make the checkout work. But you also find the COD fee, the discount coupon, group discount, and gift certificates here as well. You can also turn off the coupons and gift certificates completely for the whole cart if you want.
It's all about what happens when the order is totaled up.
Most these only become evident at checkout. Discounts are subtracted, gift certificates can be applied. Some will appear in other cart areas - some can be turn on or off on certain pages.