This textbook was adopted and redesigned from Principles of Macroeconomics 2e at OpenStax. It is used in the ECON-2105 at Georgia Tech. With support from the Affordable Learning Georgia, we leveraged media, pedagogy, and technologies to make the book more interactive with better online content presentation. We added a large collection of curated videos to help students learn the course concepts. Each chapter of the book includes quick knowledge check questions and review questions for self-assessment. Students are given instant feedback for their correct and incorrect answer choices.