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Upgrading to a new version of Windows Server 2012 from Server 2008 or Servver 2008 R2 is easy enough. However, with the simplified range of SKUs, you'll need to be sure that you're on the right upgrade path. For example, Windows 2008 R2 Enterprise can only be upgraded to Windows Server 2012 Datacenter — and the default install is always Server Core.
The dashboard gives you a quick overview of the servers currently being managed, the services they support and their current state. Green means all is good, red indicates issues that need investigating — in this case some errors from a Best Practice Analyzer scan.
Server Manager is designed to work with whole datacentres full of servers, but there's still the option to drill down into a host server and see just how it's configured — and exactly what hardware is in place.