what is the difference between a form & a folder?

Conceptually, a form and folder are like a files and folder on your computer. https://www.jotform.com/help/204-How-to-Add-or-Group-Your-Forms-into-Folders

You can group and organize form in folders

For more information on sharing forms with sub-user accounts please see our guide here: https://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-account-User

Let us know if you have more questions