You can send an email to the user who submitted the form. Also, you can get an email notification when the form is submitted.
Send an email confirmation message to the user who submitted the form
Click on the Settings icon and open the settings box
Enable the option
Collect Email addresses → Response receipts → Always
When the user submits the form, the user will get an email like this:
Get an email notification when the form is submitted
One or more people can get a notification when the form is submitted.
First, In the responses tab, enable saving the form submissions to a Google Sheet.
Open the Google Sheet. Then select the menu item: Tools → Notifications
You will get a notification whenever a new form submission is made.