Microsoft has released a document called Group Policy for Beginners which provides an overview of what you can do with Group Policies, the essential concepts and some step by step instructions to get you going. If you haven’t done anything with GPOs before and are just about to learn how this all works, this document is for you. I also recommend this document for project managers that haven’t done anything with GPOs in the past.
The document can be downloaded from here
If you plan to learn more about Group Policies have a look at the GPO classes offered by Jeremy Moskowitz here