The short version. A template is the blank form. A submission is one filled-in copy of it. Two tabs, two different things.
Think of a pad of paper forms
Templates
The blank pad in the trailer. Built once, at a desk, by the office.→ Building a template
Submissions
The ones somebody filled out and handed in. This is what the field works with.→ Filling out a form
Editing a template does not change forms already submitted
So which tab do I want?
Next
Fill one out
Draft vs. submitted, and who gets notified.
Build one
All twenty field types.