Em is definitely one of the easiest and most beautiful chords to play on guitar. It is mainly used in the key of Em and G but is also very common in the following keys: D, Bm, C, Am.
Because of it’s full sound it’s often used as the first chord of a song.
Also super fun to riff on using the Em and Em pentatonic scale.
https://vimeo.com/1062942907/967dc999ae