Check out this video on how to set up Shipping Methods for your shop:
Shipping Methods are the parameters you set up which will determine which shipping options (if any) are offered to your customers when checking out with an item from your shop.
Free Shipping: The Free Shipping method is automatically included as a Shipping Method and would only be applied to products to which you indicate you would like to offer Free Shipping on.
This would be found when setting up your Product listing in the Product Catalog here:
Note: Choosing the Free Shipping option is always a smart way to improve sales conversions and if selected your product will have a Free Shipping Icon on the product listing letting your potential customers know that this product offers Free Shipping!