It’s actually quite simple. I always thought it was difficult and you’d have to learn from a code sheet, but I found an app which teaches you and you actually just recognise the sounds like you’d recognise any other sound. You generally don’t even need to decode it- you just get used to what a letter sounds like. I’ve been learning since Saturday and can already key my name out.
Morse Toad is another learning app that’s fun because it gameifys it a bit. It’s a little limiting as you can’t adjust the code speed, but still a fun entry-level learning tool.
If anyone is wondering what real world use you could get out of learning the code, look into CW (continuous wave) ham radio activity as a hobby. It requires a license that isn’t too difficult to get and there are some pretty low cost options for getting into the hobby if you only plan on using morse code rather than voice transmission.
Continuous wave is what got me interested!