This free resource is made available to anyone looking to expand their knowledge of the guitar fretboard. The drop 3 chord shapes presented in this .pdf booklet represent what I consider to be essential knowledge for aspiring jazz guitarists. My recommendation is to start with the root position voicings on both of the string sets. These will be the shapes that you use most often. The 1st, 2nd and 3rd inversions are less common, but still very useful to know.
 
Because of the way the guitar is tuned, Drop 2 chord voicings are the standard choice for seventh chords. Drop 3 voicings are a close second. Closed voicings (all notes contained within an octave) of 7th chords are often impractical or even impossible to play since they require a very stretched finger spacing.