If you want to set up a new shop for your website, you must install all WooCommerce Plugins that my theme recommends and activate them.
Go to Pages > All Pages to check. If you have all these pages automatically: Cart, Checkout, My Account, and Shop you’ve successfully installed WooCommerce and ready to continue to the next step (add shop menu to the menu bar). But if you cannot see these pages, go to this step below:
Troubleshoot: My Shop pages are not complete
If you don’t have Cart, Checkout, My Account, and Shop in your Pages, go to WooCommerce > Status> go to Tools tab > find “Create default WooCommerce pages” and click the button “Create Pages”. It will automatically create the missing pages.
Go back to Pages > All Pages again to check.
Change Product Image Size and other settings
Go to Appearance > Customize > Woocommerce.
To change your thumbnail size / resolution, go to Product Images
Main image width = 600 (you can decide the size yourself)
Thumbnail Width = 600 (you can decide the size yourself)
Thumbnail Cropping = 1:1 (if you want square thumbnail) or custom (specific ratio, ie : 4:3 for landscape or 5:7 for portrait).
Change Products per Row
Go to Appearance > Customize > Product Archives
Product Columns = 3 (you can decide yourself)
Products per page = 9 (you can decide yourself)