What fields do
Fields decide what every entry records — and so what people fill in, what the table's columns show, and what you can filter and chart later. Open the table in Project Settings → DATA TABLE and select the Fields tab.
Every table starts with four fields that Zite fills in for you: Entry ID, Site, Created by/Date and Updated by/Date. They're marked with a padlock and can't be changed. Your own fields go underneath.