Play a C major scale with your right hand only. Start with the thumb on middle C. Middle C is the white key in the middle of the piano next to the set of double black keys.
Press the next two white keys, D and E with your index and middle finger.
Slide your thumb underneath while you are playing E and use it to play the next note in the scale, F.
Perform the notes G, A and B by using your index, middle and ring finger. At this point, you can continue to play another octave by sliding the thumb under and starting again with Step 1, or you can end the scale by playing the final C with your pinky.
Descend the scale by moving in the opposite direction.
Memorize the right-hand scale pattern and then consult a fingering chart to learn the fingerings for the left hand. When you have memorized both scales, slowly learn to play with both hands together.
Learn other scales by using a piano scale fingering chart and starting on the correct pitch. Some scales will require that you start on the second, third or fourth finger.