This is an open access book. The shift from traditional teaching to digital learning presents a significant challenge for many educators. Navigating the complexities of digital course designs can often lead to suboptimal learning experiences that fail to engage learners effectively. Digital Learning Design: Designing Effective Online and Blended Learning aims to address this challenge by offering a comprehensive guide that combines cognitive science principles with practical design strategies. This book equips learning professionals—including trainers, teachers, and digital learning experts—with the knowledge and tools needed to create impactful and attractive online and blended learning environments to foster both meaningful engagement and knowledge retention in today’s digital landscape.