Wanna know what "Drop 2" and "Drop 3" meant but were too afraid to ask? Did you know that this concept can be applied to weird chords? Not just 1-3-5-7!
My book "The 4-Note Universe" shows all 165 4-note chord types. (43 types, if you don't count inversions). You don't have to learn all of them, but learning some will help!

Pdf of Major 7 voicings (closed, Drop-2 & Drop-3): https://www.dropbox.com/scl/fi/yc0g3a...