There are five key signatures with G sharp, they are:
A major/F♯ minor (3 sharps)
E major/ C♯ minor (4 sharps)
B major/G♯ minor (5 sharps)
F♯ major/D♯ minor (6 sharps)
C♯ major/A♯ minor (7 sharps)
The key of G Major has one sharp: F#
The key of D has two sharps(F# and C#) and the key of G only has one sharp(F#)
None, only flats. B flat in F major, B, E, A, and D flat in F minor.
A major, or F# minor
The key of Gmajor has 1 sharp which is F sharp.
F# is a sharp key. A key is either sharp, natural, or flat. Never all three or two. Only one.
G has only one sharp, which is F-sharp.
The key of G Major has one sharp: F#
The key that includes both F sharp and C sharp is the key of D major.
The key of D has two sharps(F# and C#) and the key of G only has one sharp(F#)
F# major. f sharp, c sharp, g sharp, d sharp, a sharp, e sharp
None, only flats. B flat in F major, B, E, A, and D flat in F minor.
A major, or F# minor
The key with three sharps is A major, however A major uses C sharp - alongside with G sharp and F sharp - instead of D sharp.
No key signatures contain only those three sharps. With the A-sharp, it could be the keys of B major, F-sharp major, or C-sharp major (or any of their relative minor keys).
Key of F#, key of B, key of E, key of A, key of D, and key of G
The key signature that includes the note E sharp is the key of F sharp major.