The five-volume textbook provides a comprehensive overview of the fundamentals and advanced topics of psychotherapy. It is aligned with the Psychotherapist Act and the binding training and examination regulations, thoroughly covering psychotherapy within the framework of the Clinical Psychology and Psychotherapy program at the university, and is also suitable for the continuing education of physicians. The authors are scientific experts, university professors, and psychotherapeutic supervisors with extensive experience in patient treatment and practical teaching. In addition to a well-structured format supported by key points and scientific foundations, particular attention has been paid to the applicability in clinical practice. This includes case studies as well as answers to frequently asked questions from students and training participants.