So if you want to learn more about the Bible, lead a study, or teach a Sunday school class. You will get asked questions that you will not be able to answer. That will encourage you to study more. If you want to learn how to study more effectively, teach someone else how to study. Same deal. You will learn more and the questions you are asked will force you to expand your skill.
Those who teach never cease to learn. If they do, they should quit teaching.