I see people create portals so that when you step a certain block, you teleport to another part of your residence. How do you do that?
On the block you want to teleport to, type /res tpsign Then go to where you want to teleport from and put a sign under the block that says [TELEPORT] on it. Once you walk over the block, you will teleport to the block you typed /res tpsign on
Go to where you want the teleport to be to. Type "/res tpsign" without quotations. Place a sign under the block you want to activate the teleport and write only "teleport" on the top line. That easy
Everything has been said already but I'd like to advice you to also follow that link which TromboneSteve shared. Our wiki is filled with tons of information, and there are plenty of other feature signs which could be interesting for you.