The Golden Ratio.

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Okay artists, riddle me this.

The Golden Ratio in art.

https://www.youtube.com/watch?v=nXDmAtTJ6JY

I understand the basics (kinda, probably not), but I still don't understand how you get it on canvas.

Is it determined by a canvas size, e.g. you can create it out of any size canvas?

> I have A4 paper, so I need to find a point where the golden ratio is.

or

Is it determined by an artist himself, custom made?

>I have A4 paper so I have to resize to the point of the golden ratio (making a square then extending the lines etc.)

Or am I being a fucking retard, and it's all about dividing line lengths with Phi, that is 1.618? And then making square and rectangle?