This is more for the advanced students, music teachers and anyone who wants to learn jazz chords and scales. The bottom line is that instead of practicing your technical exercises by key, you are practicing them by their shared root: Getting Started on Jazz Technique - Musespeak Studio
Another quick demo primarily for students studying through the Conservatory Canada system (although anyone interested in chording can still benefit from this). ConCan students in Grade 5 and up have to demonstrate that they can harmonize a melody. In Grade 5, they use the Tonic (I) and Dominant (V). As they progress to higher grades, they must be able to harmonize using a wider selection of chords. From a speed learning perspective as well as a piano accompanist perspective, I must say that keyboard harmony is a necessity! It's saved my bacon on numerous occasions. This video shows you how to practice when you are just starting out with keyboard harmony.