Overall, you want to align your Fiscal Years so that there are no gaps from one year to the next. For Operational Fiscal Year setup, you want to make sure that your operational weeks start on the same weekday year over year, so you can compare Operational Weeks to prior years. For example, if your Operational Calendar starts on Mondays in 2021, then you will want to setup your Operational Year so it starts on Mondays in 2022 as well.
Click here to view how to set up your Fiscal and Operational Years.