i disagree, with a g chord i would mention two possibilites dependent on whether you were in c using g as dominant, so that you might need index for g7, or for melody picking on treble strings, or if you were in g[and g is the tonic chord]using pinky on top string 3rdfret, and middle on 2 string 3rd fret, or alternatively ring finger on 1 string 3rd fret , all the differnt combinations have advantages and dis advantages