Don't know where it's from, found it on reddit.Try searching for it through images.google.com or the text in the image.
The sudo thing should really be explained like "if you want this implemented system wide, run it with sudo, if not, don't use it".
Shouldn't "screw in the screw" be used instead of "tighten the screw" when you're just inserting it fully but not tightening it?
It takes a pot of practice, but it is doable.