My El Capitan machine unexpectedly died, and I salvaged the disk drive from it to put into an external enclosure attached to my new Mac, which runs High Sierra. (I never used Sierra at all, since my old Mac couldn't support it.)
Now, how do I get the Notes from my El Capitan system into the High Sierra notes system?
(As I said, even though the old Mac threw-a-piston, I still have its drive, and therefore, all that notes-data. But how do I get to it?)