There are white and black notes on the piano. The white notes have names beginning at the far left and called:
A-B-C-D-E-F-G and then it repeats.
The black notes are "behind" the notes. If a white note is "lowered"(to the left) 1/2 step, it's called a flat (b). If a white note is "raised" (to the right) 1/2 step, it's called a sharp.
So, for instance, if you are a D. The black note immediately to the left of D is called Db (D flat).
The black note immediately to the right of D is called D#(D sharp).
A-B-C-D-E-F-G and then it repeats.
The black notes are "behind" the notes. If a white note is "lowered"(to the left) 1/2 step, it's called a flat (b). If a white note is "raised" (to the right) 1/2 step, it's called a sharp.
So, for instance, if you are a D. The black note immediately to the left of D is called Db (D flat).
The black note immediately to the right of D is called D#(D sharp).