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.