Essentials of Clinical Trials is an authoritative guide that offers a comprehensive exploration of the essential elements and advanced concepts in clinical research. This textbook delves into the fundamental principles of trial design, ethical considerations, data collection and management, and statistical methodologies, providing a clear and thorough understanding for students, researchers, and professionals. Additionally, it addresses contemporary topics such as adaptive trial designs, pragmatic trials, patient-reported outcomes, and precision medicine, highlighting the integration of big data and artificial intelligence. By combining practical insights with cutting-edge advancements, this book equips readers with the knowledge and tools needed to navigate the evolving landscape of clinical trials and contribute to the advancement of medical science.