This piece also contains first and second endings. Play to the first ending, (Z), then go back to the beginning. The second time you play through the song, play the second ending (X) instead of the first.
Also the instruction D.S. al Coda means that you play the song again from the sign V until you reach the coda sign v and then jump to the second coda sign at the end of the piece.
Electric guitars contain pickups which capture the sound coming from the strings and send the signal to the amplifier. The original pickups were single-coil pickups similar to the one shown here.
These pickups are commonly found in Fender guitars like the Stratocaster, which contains three single-coil pickups, and the Telecaster, which contains two different single-coil pickups.