This book addresses the critical challenge of securing early-stage funding for startups, from pre-seed through Series A. The book is structured around three central design principles--Why, When, and How--guiding entrepreneurs through the complex landscape of startup fundraising. The methodology combines Design Science with real-world case studies, offering both theoretical and practical frameworks that are rigorously tested and refined. This approach will particularly interest readers seeking evidence-based strategies to increase the likelihood of fundraising success. Special features in the book include a "Fundraising Canvas" to help entrepreneurs map out their fundraising strategy effectively, numerous case studies providing insights into real-life application of the book's frameworks, and innovative didactic approaches, including sections tailored for academic audiences in each chapter.