How to display the SKU on single product pages in Hestia

If you have not created a child theme then be sure to create one before proceeding or your changes will be lost on next update:  How to create a child theme

After you have created your child theme add the following snippet in the functions.php file of the child theme to make de SKU appear on the single product pages:

add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_meta', 41 );