In order to learn more of something today you may have to be the one who's teaching others first.
If you are considering learning something new or brushing up on your skills, you might want to take a different approach. You are not always great at being the student, but you are great at being the teacher, and this can actually be a good way to learn. Look at what you do know and how you can impart your knowledge to others, and in the process you will learn so much more.