Teaching forces you to understand your knowledge from two perspectives instead of just your own. This helps with the retention of knowledge.

“As any teacher will attest, the best way to learn something is to explain it to someone else. This idea is backed up by the Learning Pyramid [https://en.m.wikipedia.org/wiki/Learning pyramid] , a visual tool that demonstrates the most effective ways to learn.”

The learning pyramid is ripe for re-researching as the original NLT study was lost.