Custom Order By Attributes
This tutorial will teach you as to how you can add custom sorting or ordering of product by its attribute in shop page.
Tag attributes
Add Attribute to WooCommerce Product Programmatically
Are you looking for how to add product attribute(s) through in WooCommerce programmatically, then here is the solution for all the above query.
How Product Attribute are Stored in Database
Wondering how WooCommerce stores the product attributes information in the database? In this tutorial, I have taken a deep drive in WooComerce and database which will give you a brief idea of how product attribute are organized in WordPress Tables.