Max is right on.

Learning and working with the letters at high speed sounds wacky but really works.

I suggest learning by audio rather than visual. Truly high speed code is done by audio rather than by flashing light. You can easily slow down audio but can't speed up flashing light.

Long ago in the last century I taught my best friend Morse over a weekend. ( we were in 8th grade I think) So learn it earlier rather than later!

My current use for Morse is identifying radio nav aids as I fly light airplanes. Most ident by morse letters so for me it's trivially easy vs. other pilots who have to look up the dot-dash sequences.

In the past I've read flashing lights while on the bridge of USN surface ships. Also sat down with the spooks and copied Russian code groups while on my submarine. (totally freaked out our own radiomen who'd been to code school but couldn't remember all the letters because they never used code)

For survival situations though you can only be sure the search party knows S O S. Anything more than that can't be relied upon.