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We included these chords in the first G Major lesson. This is a touch-in to make sure that you have the 7ths in G Major.
Again, the idea is to move deeper into known keys, while starting new keys. We first learn the triads and scale at the nut for any key center. Once we have the triads, we learn the 7ths. It's different for everyone, but there will be a threshold which is crossed, where/when you see how it all works...keys, chord and scale forms, & sound. There you will be able to play in any key on any part of the board and link information in ways which may be entirely novel.
7 for each chord = these can be discovered by taking the highest root [octave = 8] in the triad version and dropping it back to the next chord tone in the scale. It will be either 1 or 2 frets back in this tone group.
7 = Maj7 = Major 7 = 7th that is 11 half steps away from root.
7 = 7th is 10 half steps away from root.
If the 7 is in a Major chord, it is a Dominant 7 [just 7].
If the 7 is in a minor chord, it is a minor 7 [m7 or min7 or -7].
m7b5 = minor 7, flat 5 = half diminished 7 
Create every possible combination of chords with just frame 2, including double and triple-stops. It's not infinite, but there sure are a lot of options. We do have a complete G Major bar chord [3-5-5-4-3-3 frets] based on the E form. It's possible that after doing all of the above with frame 2 alone, it could be the last time that you ever set this limit. Or, you might do this in every key, or just a few.