This primer brilliantly exposes concepts related to special and general relativity for the absolute beginner. It can be used either as an introduction to the subject at a high school level or as a useful compass for undergraduates who want to move the first steps towards Einsteins theories.The book is enhanced throughout with many useful exercises and beautiful illustrations to aid understanding.The topics covered includeampampnbspLorentz transformations length contraction and time dilation the twin paradox and otherampampnbspparadoxes Minkowski spacetime the Einstein equivalence principle curvature of space andampampnbspspacetime geodesics parallel transport Einsteins equations of general relativity black holesampampnbspwormholes cosmology gravitational waves time machines and much more.