i have included one of my favorite sites for teaching material on chord sustitutions, scales, inside and outside comping chords and movable structures. there is a tremendous amount of information on this site, take your time and look around. some of the material is advanced but the concepts can be applied over and over again as you play. i play a comping chord style beginning with the basic chord structure of a song and substitute and walk chord changes like a lead guitarist walks scales. this site can be an additional source of information to lessons already found here to cover that type of playing. it also covers most basic chord and key theory.
Guitar Masters