First off here is the official Documentation
Yast Control Panel makes linux administration extremely easy.
You can search for a package to install such as apache, click a button and it is installed.
Want to setup up your firewall to open port 80? Click a few options in the menu.
Want to run a update on the OS, easily done click the option to do online update.
Yast with the control panel is a bit frustrating due to not all keys work when remote desktoping in.
I will help you work around these frustrations.
If you want to use Yast you will need to login remotely. With Putty or SSH.
(This does not play nice with Control Panel Console)