This John Muir publication tells you what to look for and what to avoid when buying an acoustic guitar. It then tells you how to maintain it when it’s yours. There’s a chapter on various tuning methods. Simple repairs and adjustments are also covered along with basic PA amplification. Electric guitars are given a brief overview.
Will Martin has pitched this book at the absolute beginner as well as those with some background. His tone is sympathetic and relaxed and he assumes you may know nothing. But as for himself,
he’s obviously seen, heard and touched a lot of guitars, inside and out, in his lifetime.