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Seldom used for most use cases

Calendars are low-level entities that you often don't have to worry about as resources are the main way to separate bookable entities. They are however relevant for Google/Microsoft connected resources, where you'll be using the update calendar.

When a resource is created, it is automatically given a default calendar. So you only ever need to use this endpoint in case you need more than one calendar for your resources, which is for seldom necessary for common use-cases (instead, you should probably create a new resource).

Also, if your resource is connected to Google/Microsoft, the new calendar will be created and synced in your provider account automatically.