I have come across a series of videos for beginners to piano/organ/keyboard. Although the demonstrations are done on a Hammond (organ), his deliberations apply equally to piano and keyboard.

This is what the poster (Keith Appleton) has to say about his videos:

This is the definitive BEGINNERS Tutorial for Organ, Piano & Keyboard. I will aim to show the secrets & shortcuts of how to play a keyboard very well, very quickly - and also to understand what you are doing & why you are doing it.

Lesson #1:



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Lesson #10:



Lesson #11 (and final one):