This document is an introduction to a teaching methodology guide for teaching English as a foreign language for public health professionals. It outlines three key principles that guided the development of the course materials: teaching should be learner-centered, learner-driven, and focus mainly on language production for adults. It then describes some classroom teaching techniques like elicitation to draw out responses from learners rather than just telling them answers, and how to handle error correction to avoid demotivating learners. Finally, it discusses ways to check student understanding of vocabulary rather than just asking if they understand, and the benefits of varying classroom interactions like pair work to build confidence.