If you want to get familiar with the concepts and coverage of CoreMedia Digital Experience Platform 8, then this manual is the starting point. Nevertheless, it only gives you a rough insight. If you want to learn more about all the components that comprise CoreMedia DXP 8 you should read the following chapters:
Read the "CoreMedia Content Server" chapter in the [Content Server Manual] to learn something about the basic component of the CoreMedia system.
Read the "Overview" chapter in the manual of every component you are interested in.
Attend the "Fundamentals" training at the CoreMedia Training Center, see http://www.coremedia.com/training-schedule/ for the current schedule.