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.