Discover how geometry and gravity intertwine at the core of modern physics. This book is a beginner-friendly introduction to general relativity for non-specialists. It is carefully designed for undergraduates with a basic grasp of mathematics, as well as adult learners who wish to revisit Einstein’s theory with fresh eyes. We minimize the required mathematical background and build the essential tools step by step —from special relativity and coordinate transformations to spacetime curvature and Einstein’s field equations—explaining each concept with physical intuition and clarity. By focusing on intuitive explanations and concrete examples, the book reveals how energy and momentum cause spacetime to bend, leading to astonishing predictions about the universe. Each chapter introduces key ideas in relativity in a clear and engaging way: Chapters 1–6 : From the wave theory of light and the Michelson–Morley experiment to Lorentz transformations and relativistic mechanics - Chapters 7–10 : Coordinate systems, tensors, and the energy-momentum tensor - Chapters 11–12 : Acceleration, electromagnetic fields, and the covariant form of Maxwell’s equations - Chapters 13–17 : Curved spacetime, geodesics, Einstein’s field equations, and their consequences—light deflection, gravitational redshift, and the perihelion shift of Mercury Ideal for both first-time learners and those returning after past frustrations, this book serves as a minimal yet essential guide to relativity—firmly grounded in physics, low on abstraction, and rich in insight.