It depends on how simple you want the robot to be. It could be as simple as a battery a DC motor and wheels or a simple robot with legs that are controlled with a micro-controller.
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A:Money and technology.
Leonardo da Vinci created the first Robot. He used simple pulleys and used them so the robot could move his arms and legs. he used no electricity obviously!
Wood is probably the best material to build a robot out of since it is very inexpensive and light weight. The good thing is after you are done with the wood you can use it for almost anything you need it for so there you are. So yea wood is probably the best material to use when building a robot.
There are many websites that provide users with information on how to make a home made robot. Let's Make Robots's website provides users with step-by-step instructions on how to build a robot.