When playing the piano, each hand has a specific function. The right hand, stationed in the treble-clef notes, general plays melodies and the left hand, in the bass quarters, handles the low end. Both hands generally flesh things out by adding harmony. Of course, there are exceptions to these rules; one hand sometimes ventures into the other's territory.
Shown here are the numbers that correspond to the left- and right-hand fingerings — numbers you see in musical notation, especially in the context of tricky passages. Following these suggestions can help you play the music more smoothly and speed up the learning process.