My target is not performance or complicated arrangement. My target is simplest two-hand harmony but without mistake, just good enough so I can start to enjoy the playing.

For my goal, well-prepared fingering arrangement is crucial.

One of the top 3 difficulties — 90% of the time, the next finger has to look for the key. That’s no good. Instead, I prefer to position the next finger for the key in advance. It often requires current finger assignment to be adjusted, and also the previous fingers….

That’s why I spend a lot of time deciding on my finger arrangement, and then annotation on my score.

— speed-finger practice, regardless of rhythm. 100-500 quick repetitions save time and builds fluency in fingering.

Speed practice also reduces wrong-note mistakes.

— muscle-memory .. When we need to split my concentration between pedal, both hands, and score-reading, we depend on muscle-memory reflex.

speed-finger practice builds the muscle memory.

— what if I forget my old songs? muscle memory loss?
I think muscle memory depends on fingering arrangement. Therefore it’s good to record fingering arrangement on the score.