Not so difficult!
Learned to type on a U.S. typewriter in my early teens, back in the 1970s. Have since mastered both the standard German keyboard and Russian keyboard.
Regards,
I’ve seen a few keyboards from other countries (including Japan and England) but typically the letter layout is fairly consistent.
There has been talk of putting the vowels all together and doing other things to radically change where each letter is.
And that “L-shaped” enter key in the 1990s slowed us down typing network paths (the “\” key moved and where it was had been swallowed up by the Enter key). Mistype the keystroke and you’ve entered only a partial path.