Perhaps the most famous part of the book is the final section suggesting a 10,000-hour-precursor practice schedule. He suggests rotating through material: 20 minutes on single-string work, 20 on chord scales, 20 on rhythm. He doesn't tell you what to practice; he tells you how to organize what you practice.
If you want a digital copy without piracy: Mick Goodrick - The Advancing Guitarist.pdf
While other books show you "Mode 1: Ionian," Goodrick treats modes as colors to be mixed. He introduces the concept of "Chord Scales" (choosing a scale for every chord change) and "Chord Families" (how one voicing can function as several different chords). Perhaps the most famous part of the book
This article explores the legacy of Mick Goodrick, the specific contents of his iconic method, why the PDF version is so sought after, and—most importantly—how to use the book effectively if you manage to get your hands on a copy. If you want a digital copy without piracy:
As Goodrick famously said inside the cover: "The Advancing Guitarist is the guitarist who is doing the advancing." The PDF is just the tool. You are the craftsman.