Basics

WooCommerce Product is one type of post. so basically you import post. Import Product is done basically the same way as Post.

 

Import Product Gallery Images

Import Product gallery is done basically the same way as Post Images. For more information check Importing Images

 

Import Product Categories

For Import Product Categories Refer Importing Taxonomies

 

Import Product Custom Fields / Metas

For Import Product Meta Extra meta that are not in Product Data tab please refer Custom Fields and Predefined Product Custom Fields