Fingering Principles	Piano Pages   William Wieland
Finger all of your music. You will ultimately save learning time.
Write as few finger numbers as possible—only when the hand shifts position. Write all left hand finger numbers below the staff and all right hand finger numbers above the staff. Usually assign one finger per letter or one finger per key. Short fingers play white keys. (thumb & pinky) Long fingers play black keys. (2, 3, 4) Use the weakest finger least. (ring finger) Minimize hand shifts.
The major scales follow these principles. Now you can determine fingerings for natural minor scales, melodic minor scales, modes and, above all, real music.