In Dynamics v9, there are four custom form types that you can apply to your entities, all with a variety of features attached to them. In previous versions there were more types but these have been rolled into these four as part of their usage in Power Apps and the User-Unified Interface.
If you’re new to Dynamics here’s the quick primer on getting started.
The main form is strictly what it means, it’s the central form for accessing your entity in the web view across a variety of browsers. This version of the form has been around for years.
Quick Create Form
If you want