This is the technique widely used by classical and folks guitarists. Here your hand rests above the guitar strings with the thumb roughly parallel to the strings and the rest of your fingers curved and plucking the strings perpendicularly. Note that some rock guitarists will use fingerpicking too. When using fingers (playing fingerstyle), pluck alternately with the index (i) and the middle (m) fingers. Thus use i for the first note, m for the second, i for the third, m for the fourth and so on.
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