• Excel VBA Programming for Dummies
• The Christopher Parkening Guitar Method Volume I -- The Art and Technique of the Classical Guitar
They were both good. I can't really say which was best because they are about such different topics.
I read the VBA book because I wanted to automate some tasks in my food tracking spreadsheet that went beyond what I could figure out how to do with the macro recorder.
I read the guitar book because after a long gap I got back into playing guitar, and decided that it would be best if I just pretended I was a complete beginner and started over. Also even when I had been playing regularly I was never good at reading music, so I also wanted to start over and pay more attention to the sheet music.
I don't know how good the Parkening book would be for an actual true beginner, but for a pretend beginner it worked out great and I'm playing better than I ever did before, and reading music way better too. I feel I'm good enough now that it is finally time to upgrade my guitar from the Hohner HG-13 I bought new around 1980. Next week my new Cordoba C9 should arrive.