The E minor chord is one of the simplest to play because you only use two fingers Take extra care not to allow either of them to touch any of the open strings, or the chord won't ring properly. Strum all six strings. In certain situations, it may make sense to reverse your finger position so that your second finger is on the fifth string, and your third finger is on the fourth string.
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.