Seventh chords add the 7th note above the root. There are two kinds you'll meet here. A maj7 adds the note one fret below the root (Ti): dreamy, soft. A 7 (dominant 7th) adds the note two frets below (Te): bluesy, restless, it wants to move on.
In the key of G, only D gets a dominant 7th naturally (D7, the 5 chord); G and C get maj7s; Em and Am get minor 7ths (m7), which add the same Te to a minor chord. B7 is the borrowed one you met in stage 1.
Gmaj7
Cmaj7
D7
Em7
Am7
B7
Try this
Play Gmaj7 Cmaj7 Gmaj7 Cmaj7, then Em7 Am7 D7 Gmaj7. Compare with the plain chords: same changes, new colour.
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