This is a good article for basics using network manager. A good read for anyone using Network Manager. The one issue is the hosts file editing. It is better to put the FQDN first after the IP address and then any short names after that as the first name after the IP is what the system uses to resolve it's own hostname. So the command hostname -f won't work if you have your systems FQDN second or later on it's 127.0.0.1 line. It is just a good habit to be in.