In the past Cameron posted a four part series about the same topic. In conjunction with the earlier mentioned White Paper (there is some overlap of course) you will have a good understanding about Groups in SCOM, what they do, how they function and how to use them in a proper way.
Since I am talking about Groups, I want to mention some other postings as well since they give more deep information about Group creation as well:
- Jonathan Almquist
- Stefan Stranger
The White Paper written by Cameron contains also many other links to web pages all about Group creation, calculation and Best Practices. So whenever you are bored, there is enough to read!