Hello,
The WooCommerce Shop page is what’s called a “loop” – it automatically displays your products without the use of a shortcode (there used to be a shortcode visible on the page in previous versions of WooCommerce).
In order to add additional content where you’d like, you will need to use hooks and actions. These are explained here: https://www.businessbloomer.com/woocommerce-visual-hook-guide-archiveshopcat-page/
You will need to be comfortable working in functions.php in order to do this. If you’d like to work safely in the cloud, and not on your live site, you can follow this guide to set up a staging site – https://www.boldgrid.com/support/total-upkeep/using-total-upkeep-to-migrate-wordpress-for-staging/
Please let me know if you have any other questions,
Nicole