This is the short description, which is displayed next to the Product Image.
This is the full description, which is displayed below all images.
You can also choose whether the Sidebar is displayed at the side or the bottom of your page - go to Customizer -> Woocommerce -> Layout Options.
If you don't want a Sidebar, just remove all Widgets.
You can choose which widgets to display in this Sidebar - we have included Basket as an example below.
Go to Widgets and click on Sidebar for SHOP Page.