KVM Tutorial?

I want to learn Linux KVM virtualization this weekend. I'll probably have a good undivided 6-8 hours or so to devote to it.
I have 2 goals:
1) Learn it for the RHCSA
2) Eventually try to replace VirtualBox w/ KVM when using Vagrant.

Does anyone have any suggestions for a good tutorial? I'd like to use CentOS 6, but could be CentOS 7 or Ubunto/Debian/Mint as well.