The goal of the jazz accompanist is to outlining the given chord progression clearly while complimenting the soloist's ideas. As we know, most jazz improvisations use and outline the harmony as a foundation for melodic ideas.
This chord progressions series demonstrates the most common progressions found in jazz. They will help you hear and understand the recurrent harmonic traits found in traditional jazz repertoire.
Chord changes are fascinating and I believe every jazz guitarist should continually study jazz and classical harmony. Don't forget : we comp... lots! Have you every noticed your "comping to soloing ratio" on a gig? In the context of a band, we obviously accompany more than anything.