Here are the differences between an Instructor(teacher) and a Staff

Instructors:

Instructors do not have login access unless you give them staff role.
Instructors get daily email about their upcoming class sign ups

Staff:

Staff can login. When you make a person a staff they will receive a login and password from the system
Staff can add credits to member's accounts.
Staff can accept payment from a member
Staff can manually update clients balances
Staff can add, update and cancel classes and Workshops
Staff can email members

Staff does not have access to see your revenue data
Staff cannot run revenue reports
Staff does not have access to seeing revenue graphs
Staff cannot see instructor's pay if you select them not to
Staff cannot see or run purchase history reports
Staff does not have access to export or print your member list

Looking to give an instructor staff access? Please see this article
​https://help.studiobookings.com/settings/adding-staff-access-or-permission-to-an-instructor