Some points to consider:
- The minor key is inside the circle in grey with the corresponding Major Key
- The Minor key is also the relative minor and as well, the six minor, as the relative minor is the sixth note in the major scale
- You can also find the relative minor by counting by 3 keys clockwise on the circle of fifths
- Travelling clockwise around the circle of fifths is, the fifth note of the major scale of the corresponding key. So for example, G is the fifth note of the C scale, D is the fifth note of the G scale A is the fifth note of D scale and so on
- The key of C has zero sharp notes. each key increases by one travelling clockwise
- Counter clockwise produces flats.
- For reference, a sharp and a flat are the same thing. F# and Gb is effectively the same note.