Music Theory: Lesson 10 is minor pentatonic. Leson 11 is minor triads. Couldn't find the major triads lesson.
Thanks so much for sharing!
Here is one
https://tomovhxtv.vhx.tv/videos/ftr-14-triads-learning-without-memorization
Foundation Triad Section (more dedicated to topic of triad)
https://tomovhxtv.vhx.tv/foundation-triads
You can search by " Triad " too.
Thank you.
Pablo Gutiérrez