When you offer a coupon code for the discount, customers can use it from here and it will show what coupons are available. if you want to add a coupon to your Woocommerce website, first add a coupon code
How to enable coupon functionality on your woocommerce site?:
First, go to WooCommerce > Settings > General. And click the checkbox to enable the coupon code, please see the image below. for more details please read the Woocomerce Coupon Management
The front-end view of Apply coupon on the Sidebar Mini cart:
By clicking on the pen icon next to Shipping in the front end, the shipping calculator will open, where the customer can input the location and calculate the shipping cost. Please read more about Woocommerce shipping
The front-end view of the Shipping Calculator on the Sidebar Mini cart:
The sales tax amount is displayed here. You can customize the title and taxonomy from the settings page and disable this section if you want. Please read more about the details