Im completely new to codeing and wanted to join for fun im 14 and love game design and am trying to learn how to code but i have a few questions.

What exactly is the source code i wont be codeing much as least as possible for now seems how im new and how do i includ it should i just add the whole thing chop it up to the good parts ect.

Also im useing unity dose this mean that i can not use things like there built in controllers or anything precoded im new sorry

Is there a video explaining all that i mention here as well mabby i i will just wait till next time after i learn somemore