This volume was created in collaboration between the Cultural Circle of the German Economy in BOI e.V. and the Institute for Cultural and Media Management at the Hamburg University of Music and Theatre. Both institutions have been working closely together for over ten years. For example, the Cultural Circle organizes a lecture series at the institute on the topic of "Forms of Private Cultural Funding." The editors thank the authors for their practical and detailed contributions. Special thanks go to Anne Stieve and the project group "Handbook" from the Hamburg Institute for Cultural and Media Management, which included Franziska Hammer, Andrea Kowalczyk, Michael Theede, and Karin von Voithenberg. Through their research work as part of their project studies, they have made a significant foundational contribution to the handbook.