Hello guys! I am doing a project where I gather research and assemble a remote control car. For the research bit, I was just wondering if you guys could be so nice as to help me with what are essential parts of remote control cars and what the role is of each part.

Transmitters
Receivers
Channels
Crystals
Speed Control
Motors
Transmission System
Suspension System
Servos
Batteries

It would really be a great help if you guys could help me get a better understanding of these parts. Please feel free to add in other vital parts of remote control cars that I might have missed out. Thanks a bunch!