Who this book is for 

Mastering WooCommerce 4 is aimed at anyone who builds WooCommerce sites. You could be a developer who builds sites for clients or you could be a store owner who wants to take a DIY approach with your own store. 

You should be familiar with the basics of WordPress. That means understanding what plugins do, what a theme does, how to install plugins and themes, how to keep your site up to date, and how to create posts and pages.