If I were to create this: https://www.w3schools.com/howto/howto_css_contact_form.asp
Obviously, I would result in an email to "me" if I'm the owner of the website. What additional coding do I have to do to facilitate this?
High level - If I wanted to create a site were I can sell t-shirts and take online payments, how many layers to that programming onion? Disregarding aesthetics, what would the functionality look like?