Circle of Fifths
First, everything starts from C, since C is the key in which there are NO sharps or flats.
As we move clockwise from C, each note is a fifth above the last. So G is the fifth of the C scale, D is the fifth of the G scale, and so on.
Starting with G, each new key going clockwise has one more sharp note in its major scale. You can test if you wish, by building a major scale on each note.
If we move counterclockwise from C, each note is a fifth below the prior note. And, just as with sharps, each scale to the left of C adds a flat note.
Note that at the 6:00 position, there are two notes -- F# and Gb. These, of course, are enharmonic notes -- they sound exactly the same and are the same.
Their names are different only because they are reached from different directions.
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