Hey Dimple, Hope you are doing well!
- For this tutorial we used this robot kit(https://www.amazon.com/Smart-Chassis-Motors-Encoder-Battery/dp/B01LXY7CM3/) which comes with two motors. So output1-2 are connected to one side of the motor controller and output3-4 are for the other motor
- Ahh I see the wording in the tutorial is not super clear. One of the solenoid wires should be in the NO slot of the relay and the other wire should connect to the pi ground. The COM slot should be receiving 3.3 from the raspberry pi
I hope this is helpful!