Tracking traffic source of form submissions

Im trying to track which traffic source each form submissions came from.

I’ll have 5 different sources sending traffic to my website landing page where i’ll collect names and email address to join my newsletter. I want to automatically or easily serrate each form submission list by which traffic source the submissions came from.

If anyone knows how to create referral links that track traffic that would be helpful too.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Numerous duplicate posts.