The first thing to keep in mind is that ASDW was designed to be a cloud based system. As such, it aims to be very flexible for resource allocation and very efficient to scale up or down. To meet those goals, the system allows you too:
Increase or decrease compute power represented by Data Warehousing Units.
The amount of storage can grow and is charged independently from the compute power.
The compute power can be completely paused and only storage is payed at that point.
Warner also has a brand new Pluralsight course on the topic.