Update:

I did some reasearch and I think I can do the same thing as this article about an arduino and DC motor but with an Onion.

https://openhomeautomation.net/remotely-controlling-a-motor-using-arduino-python-and-php/

I have a noob question as I get started using the onion. I'm starting to set up the DC motor using the PWM module. but if I want it to go forward and backward am I going to need 2 signal pins because it seems like the PWN module only allows for 1. Maybe that isn't how that works. Maybe could someone link me a resource to see how to set this up? Thank you.