Schedules are one of the most powerful functions in Revit. Once you have developed an understanding of how to create a schedule and how it connects back to the model you are well underway to mastering the database side of BIM. You need to think of schedules as a facility to interrogate the model to produce measured, quantifiable and calculable data. Revit schedules are editable which means you can design a schedule to suit your need. This is a really valuable skillset to have.