My SO has this idea that I should teach her to play the guitar. I'm not sure that I'm the teacher type, however, I'm willing to give it a shot. As such, I only know my own experience as a kid and I realize that model may not be appropriate. 1) what guitar ? I started with a nylon string guitar and after a time, stepped up to a steel string acoustic with silk & steel, then regular acoustic strings. I see her strumming, not fingerpicking, but it's hard to predict. I'm not sure a parts-o-caster is the best choice. 2) what approach? I was taught A & D, then played Michael Row The Boat Ashore....and so on. I don't know if teaching chords for songs is a good or unbalanced approach. (She's probably not going into be-bop.) 3) books ? I had a songbook and no theory for a long time.