Spacetime Physics (2nd Edition)
by Edwin F. Taylor, John Archibald Wheeler · W. H. Freeman
The definitive conceptual treatment of relativity. Classic special relativity text built on spacetime diagrams, the invariant interval and many worked puzzles and exercises. It covers Lorentz transformations, momentum-energy and relativistic collisions, and its final chapter introduces gravity waves, black holes and cosmology. Can be found on https://eftaylor.com/spacetimephysics/ for free, but does not offer a secure connection (https).
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