Scales/key signature and composing?

Fredrik

New member
Well I decided to compose when I realized that I have no idea what the scale actually does.
Let's say the key is B-minor, if I played a piece in B-minor I know that every C and F would be sharps, but how should I compose when I have chosen my key? I asked someone I know and the answer I got was "It focuses on the B-minor scale".

What does this mean?
 
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