The two main schedule types are Repeating and Non-Repeating.
Do you have consistency in the times your personnel are schedules?
If so, a Repeating Shift will probably work best for you. You can set up any configuration of time frames that repeat, then fill in your personnel from there with no need to constantly create shifts. See the Repeating Schedules section for more information.
If the times your personnel are irregular (varying time frames, varying shift length, etc), then a Non-Repeating Schedule may be better. You can create a non-repeating schedule, which is essentially a container for non-repeating shifts. Non-repeating shifts are shifts that occur only once, so you will need to make every shift individually. Non-repeating schedules are also great for shifts such as Events or Trainings.