Chordal practice is a little hard to pin down; many players learn a lot just by playing their favorite songs. If you're interested in expanding your chord knowledge, you can try one of those huge chord books with 17.2 billion chords in them, and try to learn a new chord each week. A more realistic goal is to figure out more voicings of the chords you already know, and work on those.

You can use the fingerboard charts to plot out the notes and try new chords, or you can randomly put your hands on the guitar and try to name the chord. If you're a beginner having trouble switching chords, slow down the motion and switch the chords twenty times in a row without mistake. If you can do any task twenty times in a row without mistake, you can say that you know it. There are always lots of things to study with chords, so don't think that after you know all the chords in this book you're done. We've only scratched the surface of chords. Chords and harmony on the guitar is a lifelong study. Appendix A lists resources for some great chord books.

Sight-reading is one area of musicianship that many guitar players overlook. There's an old joke that goes like this: “How do you get guitar players to stop playing? Put sheet music in front of them.” While it is possible to learn guitar just by listening and memorizing, learning to read music will open up many new doors of opportunity to you.