Open Letter from a Computer Techie: "Most of the time. . . ."

i'm hardly a computer expert.  MyGuy is; he tells me "Do whatever you like; you can't break it."
And once every couple of years i do "break" it.  Spectacularly.
But usually the just "try something" concept works.  It's gotten me, pretty much an untrained person, something of a reputation as a computer expert.
Check out this Tech Support Cheat Sheet:
https://xkcd.com/627/