Children and adolescents need attention, support, and encouragement from their teachers at school – in short: they need guidance through relationships. When relationships are a central part of learning and schooling, teachers must know how to professionally build and strengthen relationships with students, parents, and other professionals. The authors of this guide explain why relationship-building is a necessary key competence for all teachers, especially in inclusive schools, and how it can be gradually learned. Case studies and practical tips assist the reader in applying this knowledge in practice.