Erasing trouble codes?

Hello, how are doing today? Man I really appreciate you all being here I would make a donation but I just do not have it. My dad was a plumber and foreman all of his life and I ended up long distance trucking for about thirty years and I just retired about two years ago. I have one other question that I would like to ask you all about. Erasing codes. If I disconnect the ground off of the battery for about thirty minutes and use a jumper wire (someway that I seen on YouTube) to drain the capacitors and the computer is this way safe and will this way keep the codes from coming back? If I plug my computer plug in to the alternator and not power surge my new alternator and burn it up and keep the battery charged until my scan-tool gets here? I would really like to drive the car until the scan-tool gets here. Can you all reply back one more time to me please as soon as possible?