Using the same claw-like finger positioning on the second fret, you can play an F# chord. Move to the third fret, and it becomes a G chord. It's a difficult finger positioning to learn, but you can start playing the chords to any rock or pop song relatively quickly when you learn to strum and play barre chords. The Ramones, for example, used nothing but barre chords to great effect.
Now I know you might be confused by this diagram, so let's take a moment to explain it. First off, the top of the diagram corresponds to the nut on your guitar, that's the part where the strings end, farthest from your body. Left to right, the strings are 6,5,4,3,2,1. So as you look at the diagram, the string on the left is actually the 6th string on your guitar, the low E string.
Practice fretting the strings. The frets are the metal strips that run perpendicular to the strings that mark each note. To play a note, press your finger down between the metal strips, not on them. To say that you're playing the third fret means that you place your finger on the string in the gap between the second and third fret. If you hear buzzing, move your finger away from the lowest fret and closer to the higher fret. Hold the string down firmly so that it only vibrates between your finger and your strumming hand, with the tip of your finger doing the pressing.
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