Watch the C6 & G7 Play-along online guitar lesson by Marcy Marxer from Swingin' Rhythm Handbook

Again, practice the C6 and G7 chords slowly. Give yourself a visual reference using your pinky finger on the 3rd fret of the 5th string for the C6 and your first finger on the 3rd fret of the 6th string for G7.

The idea of reaching for the bass notes of both chords in the same fret will be very helpful when playing these chords up and down the neck.