Nearly three years ago, I wrote up a blog post about how to learn physics: “So You Want To Learn Physics.” It’s been a big hit over the years, and I frequently get lovely emails from readers who have been following the learning plan (sometimes, for a couple of years!) and are having lots of fun learning physics.

I find learning very rewarding. It’s rewarding in the classroom, but even more rewarding (and fun!) when conducted independently. It takes a bit of self-discipline, but I’ve found tha...