How to send a confirmation email with a copy of the form response to the respondents?

You can enable response receipts in Google Forms to send a copy of the response to the users when they submit the form. If you want to customize this notification email or use Google Forms with Formfacade, you can use Mailrecipe to send these notification emails.

How to send notification emails to form respondents?

Pre-requisite: You must have installed the Mailrecipe add-on for Google Forms. If you haven't installed the add-on yet, you can install it from G Suite marketplace using this link.