I am 66 years old and am retiring at the end of the year. I decided to return to playing guitar, which I dabbled in as a teenager. I bought myself a Martin LXK2 guitar right here. ( Beautiful 3/4 sized instrument made of HPL with beautiful tone and projection. No humidity worries and a sustainable product as it's made of recycled materials. See my review) It was $280 well spent. I opened the bag, tuned the guitar and to my delight, my aging brain had retained chord after chord: G, C, C7, D, A, A7, E all came back along with the string names E, A, D, G, B, E! Determined to build on this antique knowledge, I searched for a convenient chord book, and see that the reviews I read did not lead me astray.
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.