This site hosts a number of books for learning the Guitar and Bass.
The books are available in Print or eBook format (PDF). The books are said to be graphically detailed, featuring fretboard diagrams, tablatures, purpose made diagrams of various types, photographic examples and professional hand drawn illustrations.
The books also feature musical pieces to make the learning process more enjoyable, and allow beginners to learn technique in a musical context. Various areas of guitar technique and playing are discussed by the books, including playing techniques, fretboard layout, chords and their construction, how to strum, rhythm reading, theory, lead playing, power and barred chords and more.