This document summarizes key theories of learning and teaching. It discusses three main contemporary ideas about learning: 1) learning is an active process of engagement rather than passive absorption, 2) learning is both an individual and social phenomenon, and 3) learner differences are resources rather than obstacles. It also discusses the idea that students need to develop flexible understanding of content that includes facts, concepts, and how to apply knowledge critically. The document then discusses implications for teaching, including that teaching is complex intellectual work, teachers have varied roles, and effective teachers structure classrooms for individual and shared work focusing on high-level content.