Where do you draw the line between cheating and referencing? If I made a Game of Life implementation, would you think differently of it based on whether I had u

Where do you draw the line between cheating and referencing? If I made a Game of Life implementation, would you think differently of it based on whether I had used YouTube rather than Wikipedia to learn about the specifics of the problem? Or is it a matter of not copying-and-pasting -- something which I do occasionally even in professional work?