Hi wensi_peng,
There are a number of lessons from many of the instructors on triads - 3 note chords/inversions. I’d have to poke around but I know Christopher, Anders and, as mentioned above, Lisa have covered this topic. I believe seeing posts from Mike and Gary also.
Type “triads” in the search box and you’ll see a number of lessons.
Power stuff, triads. It may be what you’re looking for.
Rumble Walrus
edited