We were taught to start all capital letters at the top and all lowercase letters (as they need to be connected) in the bottom left (or just left for some like v, that don't really have a bottom left).

Particularly for x, they said we might as well learn to start x from bottom left when printing as well, because then it'll be consistent with the cursive, but I find that when given the choice, I'm more naturally drawn to go top left to bottom right and then top right to bottom left, so that's what I do when not writing cursive.

Edit: See my other comment for the cursive we were taught.