This document discusses key concepts and principles for teaching English as a foreign language. It lists reference books on language teaching methodology and summarizes research findings on second language acquisition. Some key points made are that adults can acquire a second language, but more often fossilize, and that meaningful context is paramount for language learning. It also discusses advantages children have in learning a foreign language and qualities of good language learners and teachers. Finally, it contrasts several important concepts in language teaching, such as deductive vs inductive learning, performance vs competence, acquisition vs learning, and others.