Watch the G Form For All online guitar lesson by Brad Carlton from Chord Studies: CAGED Chords Vol. 1
This example applies the G form out of the CAGED system to play both an A and G chord. When you play the A chord with the G form, it is suggested you go ahead and bar all six strings, just as if your first finger is functioning as a capo. That will bring your second, third, and fourth fingers into a more upright posture and make fretting the right notes easier for your fretting hand.