English teacher or tutor willing to help student improve or learn about English or other languages of interest

I started giving French lessons to be able to help others. Afterwards, I realized that not only was it a way to learn better by what I retained much better by seeking the way to make the other understand what the lesson contained without it being a stuffing of the skull if not a complete and full of real knowledge.
Little by little, I realized that I was passing knowledge on to someone and that it produced in them an interest not only to teach others, but also to seek more information. Much of the motivation and satisfaction of this work comes back when you see the tangible and effective success in the student.
This motivated me more and today 9-10 years ago since then I started teaching biology since I am a doctor and also Spanish, French and English as a polyglot myself.