Place your ring finger on the 3rd fret of the low E string
Place your middle finger on the 2nd fret of the A string
Place your index finger on the 2nd fret of the A string if using an alternate G shape is not needed
Place your index finger on the 2nd fret of the A string and your ring finger on the 3rd fret of the low E string for the standard open G chord
Place your pinky on the 3rd fret of the high E string
Strum all six strings
Avoid muting the D, G, B, and high E strings
Keep your fingers arched so each string rings clearly