You're welcome.

Calendars are also mostly clear. When a task is first created its schedule is driven by the definition of working and non-working in the project calendar. (Set in Project Information).

Resource also have their own calendars that are created when the resource is created.

When a resource is assigned to a task, the definition of working and non-working time in the resource's calendar becomes the schedule driver.

You may also assign specific calendars to tasks on the Advanced tab of the Task Information dialog. When assigning a calendar to a task you can select whether the resource's calendar is ignored - otherwise the task will be scheduled for common working time between the task calendar and the resource's calendar.

I hope this helps.
Julie