So I read something about "backfeeding" and that it can damage my Pi. What exactly is it? I didn't understand the article. BTW, I'm a complete noob so please try to be as un-technical as possible.
I'm using a portable charger with a micro USB. It's 2.1 AMPS. I don't know how good the quality of it is, I just found it somewhere in my house.
Also, where in the pi do I plug it into?
I'm using a Pi 3.