OpenCart provides you with many different options when dealing with how to get your products to your customers. You can apply different shipping methods to specific Geo Zones you specify so that shipping method will be available to your customers who live in the Geo Zone. If you have already read through the Introduction to Geo Zones article, you may want to.
If you want to offer a shipping method to all your customers (such as free shipping or flat rate shipping) you can do so by applying “All Zones” method to the Shipping Methods you’re working with.
In the screenshot below, you can see some of the shipping methods available to you by default: