OK, time to get serious. Here's a long, thorough beginner and intermediate tutorial about Kernel-based Virtual Machine (KVM) virtualization, including overview of technology, terms, pros and cons for usage, initial setup, Virtual Machine Manager (VMM) GUI tools, virsh command line, virt-install helper utility, KVM options, preferences, kernel virtualization extensions versus emulation mode, how to create and manage machines, multiple virtual machine examples, and more. You will like this.