They prepare decisions, prioritize, independently manage projects, and serve as the information interface within the company, as well as being the first point of contact for colleagues and business partners. In recent years, assistants have increasingly become advisors to their superiors, fulfilling their tasks at a level comparable to that of management itself. The rising performance profile demanded of secretaries and assistants in the modern workplace necessitates continuous professional development, particularly in the areas of business administration, law, and leadership knowledge. This compendium, now available in its second edition, offers condensed expert knowledge on key topics in management support. The authors, all recognized specialists in their fields, provide foundational knowledge and offer readers actionable practical tips for everyday office life.