This document provides an overview of theories and practices for teaching English to non-native speakers in K-12 schools in the US. It discusses the complexity of language learning and how sociocultural factors like immigration and language policies affect the situation. Effective teachers for the over 5 million English learners require specialized knowledge and skills. The document reviews language learning theories and approaches, focusing on sociocultural theories. It emphasizes that teachers must have pedagogical expertise to meet the needs of this growing student population in a culturally responsive way.