Add a note under the product details to WooCommerce order emails.
Add a custom note to your WooCommerce emails. Use actions instead of changing templates. It can be simple or complex.
Make the variation dropdowns user friendly by changing “Choose an option” to use the attribute name and be more clear.
Set an upper or lower weight limit for the shopping cart and prevent checkout.
Hook and actions are the means to expand WordPress. They are *everywhere* but they are *not* scary. I promise.
Apply a free shipping coupon when the cart contains only one item.