This book provides a detailed exploration of general relativity, a theory developed by Albert Einstein to explain the geometric nature of gravity as it relates to space-time curvature. It covers fundamental principles, including Einstein's principle of equivalence, and discusses the application of field equations to phenomena such as planetary dynamics, black holes, and the universe's expansion. Key concepts such as space-time, manifolds, coordinates, and cosmological models are elaborated upon. The book also examines experimental tests of |