This video starts a series on RF Tools[1] by tackling the teleportation system. Start by learning about the Dialer, Matter Receiver, and Matter Transmitter. Then proceed to learn how to make safe teleports using the Matter Booster and Destination Analyzer. Finally, there's a quick review of how to set up a Simple Dialer, and finally, a completely assembled system.
Minecraft v1.12.2
RFTools v7.73
[1] https://www.curseforge.com/minecraft/mc-mods/rftools