Playing around with the major octave scale lead me to a much deeper understanding of Major 7th Chords.
Take aways from this-
Using a progress bar can give your students a nudge. It is easier to hit a target when you can see it in front of you.
Getting students to play all of the keys on the piano regularly, even before they understand how to read the notes makes it easier for students to make progress.
Graphic libraries can boost your online teaching.
When you create graphics to share with your students, minimize the stuff on the page.
The full graphic library for the Major 7th chords is an added bonus to the 4 Note and Octave scale graphic library here.