The present day keyboards are wonderful, and I think back to when I too used to rattle out a few songs on an old, badly tuned piano in a pub that I used to frequent. I also remember one evening when two of us were jamming on two pianos, and a rather inebriated clown shouted "Rubbish". My friend got up, grabbed him, sat him down at his piano, and said "Do Better"...........To complete ridicule, the man left the pub shortly afterwards, being unable to play anything at all.....A good lesson there.
Playing is the main thing. Just enjoy playing it, and use only the knobs and buttons that you find useful. There's no need to ram your brain full of elements of the keyboard that you don't use, will never need, and can't get your head round.
My own particular bugbear is with music scores. Why some composers write them with 5 flats or 5 sharps I know not, but I completely avoid such music. It's way too complicated for my old head to comprehend. I can play many many chords and read music, but my old music teacher I think had a point when he said that the more complicated the music was, the more the composer was trying to show off HIS expertise, whilst making it totally indecipherable to most players.
So enjoy whatever keyboard you have , and play it. the rest is theoretical.