12tone is an online education channel that covers all sorts of musical topics, like harmony, arranging, and composition. He publishes a new video (almost) every week, and seeks to inspire a love of music and music theory in as many people as possible.
In addition to these rich analysis videos (that also include some classical topics as well), 12tone has a great playlist for beginners to music and music theory.
I highly recommend this Building Blocks series for anyone remotely interested in learning more about music, even if you don’t want to “be a musician.” It’s super approachable and goes through the basics from “what is a note” all the way to building chord progressions and borrowing chords from other keys.
Plus, each video is usually only 10–15 max. You can learn a lot in just 10 minutes!