Alright, lets kick this study series off on a low note: VTP. Short for VLAN Trunking Protocol.
VTP is one of those things that is pretty horrible, really no way around that. If the idea of saving a couple of seconds of configuration time for the low low price of crippling your network in about 3 seconds sounds appealing to you, then read on. Or, if you are studying SWITCH, then also read on, because Cisco insists that you learn this.