Try practicing a song backwards once in a while. Hehhhh?? No, not literally backwards, but try starting with the last slur.

A ♯ or ♭ in Pimba only applies to that one note. But sometimes there might be some doubt whether you should play a white key or black one. When in doubt, this symbol is used ♮. We call it a natural.

Your little finger and your thumb are shorter than your other fingers. That makes them less suitable for playing black keys. Because you can't reach them easily.