C Major

Check all the posts in my blog to learn guitar scales and chord. You will get a clear image about how the chords are placed on the fretboard of guitar by looking those images. You can enlarge the images by clicking on it.
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Look up on the C major scale :C major is a musical major scale based on C consisting of the pitches C,D,E,F,G,A,B and C.Its key signature contains no flats or sharps.It is a natural scale. When you go through the older posts of chords and scales it will be much more clear for you.
All the best and have a nice time!

C Relative Minor

C minor (abbreviated Cm) is a minor scale based on C, consisting of the pitches C, D, E-flat, F, G, A-flat, B-flat (often raised to B natural to ...

G Major

G major is a major scale based on G, consisting of the pitches G, A, B, C, D, E, F# and G. Its key signature consists of one sharp.

G Relative Minor

G minor is a minor scale based on G, consisting of the pitches G, A, B-flat, C, D, E-flat, F sharp which does not appear in the key signature ...en.wikipedia.org/wiki/G minor

D Major

D major is a major scale based on D, consisting of the pitches D, E, F♯, G, A, B, C♯ and D. Its key signature consists of two sharps. en.wikipedia.org/wiki/D major

D Relative Minor

D minor is a minor scale based on D, consisting of the pitches D, E, F, G, A, B-flat, C, and D (natural minor scale). ...en.wikipedia.org/wiki/D minor

A Major

A major is a major scale based on A, consisting of the pitches A, B, C♯, D, E, F♯, G♯, and A. Its key signature consists of three sharps. en.wikipedia.org/wiki/A major