The book, published by Harvard Business Review Press, provides comprehensive guidance on starting and expanding a business. It is adapted from the Harvard Business Essentials Entrepreneur's Toolkit and includes insights from Alfred E. Osborne. The book is divided into five parts: preparing for entrepreneurship, defining the business, financing, scaling up, and future planning. It covers essential topics like business model development, financing stages, and maintaining growth. The text emphasizes the importance of recognizing opportunities and creating organizations to pursue them, illustrated by examples like Thomas Edison and Airbnb's founders. The book also discusses the risks of entrepreneurship, noting that 75% of startups fail to return investors' capital, and highlights the role of entrepreneurs as agents of change in society.