Student belonging shapes how learners see themselves, connect with others, and engage in school each day. When students feel known, respected, and supported, they participate more fully in learning and seek help sooner when challenges arise. For K-12 schools, belonging connects directly to wellness, attendance, behavior, and long-term success. It also supports school climate improvement by helping every student experience school as a safe and welcoming place. This guide explores how social emotional learning, inclusive school environments, family engagement, and practical measurement tools can help educators build stronger connections across classrooms, counseling teams, and the wider school community.