This book is an up-to-date, user-friendly textbook written with the aim of making easy learning of epidemiological methods and applying them in public health research. Written in clear and accessible language, the book simplifies complex topics for easy understanding with examples, making it ideal for students, researchers, and public health professionals at all levels--from undergraduates to postgraduates and educators. The book has a unique combination of relevance, comprehensive coverage, and practical explanations to provide students with a thorough grounding in key epidemiological concepts and methods such as study designs, measures of association, evaluation of a diagnostic test, bias, confounding and interaction, and more. Easy to read and understand, with practical examples to explain key concepts Provides essential epidemiological concepts and methods, making it most suitable for beginners, intermediate students, and practicing epidemiologists in medical and public health studies and research. Includes chapters that are often overlooked in other epidemiology books, such as measures of agreement, sample size calculation, sampling methods, and the application of AI in public health Beyond standard topics, the book includes essential yet often overlooked chapters such as measures of agreement, sample size calculations, sampling methods, and the application of AI in public health-equipping readers with skills that are vital in modern research and practice. Easy to read, the book is an inevitable resource for beginners and intermediate students and practicing epidemiologists who play an active role in medical and public health studies and research.