One of our members ask how he could build a robot but lacked parts, money, soldering iron and so on.
I decided I would try to come up with the simplest way a small "robot" car could be done without all those things.
He said he had an old car he could use, and that he had some motors and wires.
Without a soldering iron connections can be made by twisting wires together. It is not a good way, but will work for a little while. If your robot stops working check that the wires have not come loose.