This book is written by several medical educators from developed as well as developing countries based on decades of experience in teaching. The unique experience gained during the COVID-19 pandemic has added new dimensions to the traditional pedagogy, andragogy, and heutagogy, documented here. The salient topics include distance learning, virtual classrooms, virtual workshops on OSCEs, open book exams, micro-learning, micro-credentialing, blended or digitalized curriculum delivery, academic leadership, communication skills, professionalism, telemedicine, bioethics, cyber clinics, artificial intelligence, etc. This book is used as a text or reference book by physicians, teachers, scholars, students, and medical universities for teachers' training, capacity building, and guidance on fundamental pillars of cognitive domains of knowledge, skills, and attitude, as well as factual, conceptual, procedural, and metacognitive skills. It is also a source of guidance in faculty enhancement and toward continued quality improvement in medical education.