The handbook provides a toolkit for successful engagement in the teaching profession in the best sense of the word. It is aimed at students in internships, teachers in preparatory service, as well as educators in their early career years. It offers orientation knowledge about the fields of action and challenges of modern schools. The focus is on concrete tools and methods for those who are new to the field of education, as well as current and well-founded background knowledge to avoid falling into the trap of mere recipes. Practical suggestions for recognizing and further developing one's own competencies lead to the mindset of the reflective practitioner. The authors come from extensive experience in schools, school leadership, universities, and teacher training, representing authentic and individual perspectives while conveying their topics.