In Weebly, there are different types of addresses you can have for a store. There's the main store address (configured on the Setup page) used on invoices and other correspondence. You can also have a shipping address, which may be different from your main address. This is where you ship your orders from. This address has tax implications, as where you ship your orders from can determine the taxes you need to collect.
You can also set up additional addresses on the tax page. These addresses represent all the physical locations for your store, including your main store address and shipping address. It's important that you list all addresses, as you may need to collect taxes based on where you're located.