"Microsoft 365 Excel: The Only App That Matters" by Mike Excelisfun Girvin is a comprehensive textbook published by Tickling Keys, Incorporated in 2022. This trade paperback book covers a range of topics such as data modeling, analysis, and dashboard reporting, making it essential for business and economic students as well as professionals working with dynamic data-driven decision-making. With 806 pages, this educational resource provides in-depth instruction on Microsoft Excel, making it a valuable tool for anyone looking to enhance their skills in data modeling and design.