Piano scales and chords to play to develop you technique on piano.
Scales In Thirds With Fingerings Marked
I. Right hand.
These fingerings can be used in all tonalities.
II. Left hand.
Other piano exercises
III. Right hand. Minor thirds.
IV. Left hand. Minor thirds.
V. Right hand. Major thirds.
VI. Left hand. Major thirds.
Piano exercises : online examples
In these pages linked, you can find other helpful online piano exercises