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About Time by Paul Davies is amazing!

Einstein's original book is a good read. For quantum mechanics I recommend Feynman's QED. Wiki has some decent articles too. https://en.wikipedia.org/wiki/Introduction_to_general_relati...

As a basic introduction which explains some of the actual maths going on, Why Does E=mc2? by Brian Cox and Jeff Forshaw is excellent.

"The Fabric of the Cosmos: Space, Time, and the Texture of Reality" by Brian Greene.

imo best for that: The Black Hole War by Leonard Susskind