WooCommerce
https://www.youtube.com/watch?v=tcc-BGo45rQ&t=26s
https://woocommerce.com/document/installing-uninstalling-woocommerce/
https://woocommerce.com/document/woocommerce-memberships-quick-start
https://woocommerce.com/document/woocommerce-memberships-import-and-export/
https://woocommerce.com/document/flat-rate-shipping/
https://www.wpbeginner.com/wp-tutorials/how-to-customize-woocommerce-emails/