Reason 2 of 5: Teaching Improves Your Knowledge
Imagine that your full-time job is being a teacher of the Quran. This means that before a class, you at least need to plan your lesson notes and reread whatever portions of the Quran that you would be teaching your class.
Every time we teach the Quran regardless of the type of audience, it helps us improve our own knowledge too, especially through the way we must have prepared for the teaching session. 
