G Major is a little bit tricker than the last two chords I showed you. Just remember playing the guitar is totally alien to your fingers so it will feel really weird and awkward for a while. I promise you this goes away with practice. So be patient with yourself. The more you practice these chords the more familiar your fingers will get and it will become second nature after a while.
Place your 1st finger on the 2nd fret of the 5th string, then place your 1st finger on the 3rd fret of the 6th string. Now this next bit can be tricky so don't worry, place your 3rd finger on the 3rd fret of the 2nd string and then the 4th finger also on the 3rd fret of the 1st string. This can be a bit of a squeeze so again be patient with yourself.
The notes in G major are
1 = G
3 = B
5 = D
There is another way to play G as an open chord. The note you are holding down on the 2nd string, 3rd fret is a D the 5th of the chord, If we take that finger off you will get the 2nd string open which is a B the 3rd of the chord. So both versions are a G major with just slightly different voicing. Just playing the top 3 strings of the chord you'll hear the difference. With both fingers on it's a bit 'tighter' sounding (I think this sounds good for Electric guitar especially if you have a distorted sound). With the finger off it's a bit more open sounding, maybe good for folk/country. Ultimately don't let that dictate which one you use. Use the one you feel sounds best for the song you are playing.
You can swap the 4th finger with the 3rd finger here if you prefer
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