The G Major Guitar Chord is found in the G Major Scale: G A B C D E F# G. It is made up of the 1, 3 and 5 of this scale. Meaning the notes G, B and D.
There are two different chord charts or variations of this chord pictured below. The chords are identical except for the fingering. There will be situations where you will need to change your fingering of this chord so make sure to practice both versions below. For instance, if you were switching from G Major to Gadd4, you would have to play the first version below as you need your first finger to press down on the first fret of the B string.
G Major Chord notes: G B D
Here is a key that will help you read the chart:
The G Major Guitar Chord is one of the most common guitar chords. You will see it in many songs, so it is very important that you learn how to play it. Just like all other chords, make certain that you are pushing your fingers down firmly on the strings. Play each string one at a time to see if the strings are producing a clean sound.