This is a thick little book with nice big chord diagrams and shows chords in various positions. I like that it is spiral bound. The only thing missing is tabs for the letter sections so that you an easily flip to the letter note/chord you're searching for rather than having to turn a lot of pages to get to what you want. I plan to put in my own divider tabs.
Unlike many string instruments which use a bow to create a sound, guitars are played by plucking or strumming the strings on the instrument, which vibrate to create a sound. Chords are played when the guitarist holds their fingers down on more than one individual string to change its length, which in turn changes the frequency of the vibration created - in other words, it creates a different note. Performers often use guitar tabs, rather than sheet music, when learning music: this acts as a kind of 'map' to teach guitarists where to put their fingers on the strings.