I’ve watched the video and I’ve already set up categories and assigned categories to all the posts. None of the posts are visible to the public yet.

The Art Store is blank. That’s what I need your help with and the WooCommerce plugin.

Answer :
Lynda, what you need to add to your WP site is a Woo-Commerce Plugin.

Check Lynda Makara’s website now after her WP lesson. Link here.