What are the different guitar pitches and how are they produced?

Guitar pitches are produced by varying the tension of the strings and the length of the vibrating portion of the string. The main pitches on a guitar are E, A, D, G, B, and E, which are produced by tuning the strings to specific frequencies. By pressing down on the strings at different points along the fretboard, players can change the length of the vibrating portion of the string and produce different pitches.