This document discusses four major learning theories: behaviorism, cognitivism, constructivism, and humanism. Behaviorism views learning as changes in observable behavior and believes behaviors are shaped by environmental influences and reinforcement or punishment. Cognitivism focuses on mental processes and how information is received, organized, and stored in the mind. Constructivism holds that learners construct knowledge based on their own experiences. Humanism considers learning to be a personal act and emphasizes developing self-actualized individuals in a supportive environment. The document then provides examples of how each theory is applied in language learning, such as audiolingual method, cognitive code learning, genre-based instruction, and community language learning.