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The notes of the G-sharp major scale are: G#, A#, B#, C#, D#, E#, Fx, G#. The x you see is called a double sharp. (Double sharps raise a note higher by 1 whole step. Fx is actually G.) However, because of the simpler enharmonic equivalent of Ab major, which has 4 flats, Ab major is used a lot more than G# major ever is.
Flats lower notes, and the order of the flats goes down by fifths: B-flat, E-flat, A-flat, D-flat, G-flat, C-flat, F-flat. If you remember the first sharp (F-sharp) and the first flat (B-flat) encountered in key signatures, along with the rule of fifths, you can easily build any key signature.