This learning module provides an overview of key concepts related to child and adolescent learners and learning principles. It is divided into four modules that cover basic concepts of human development, developmental theories, development at various stages, and learning theories. The first topic introduces the 14 Learner-Centered Psychological Principles developed by the American Psychological Association, which are divided into cognitive/metacognitive, motivational/affective, developmental/social, and individual difference factors. The principles emphasize that learning is most effective when the learner constructs their own understanding, thinks strategically, and is influenced by environmental context. Future teachers are asked to consider how to apply each principle through classroom activities.