Isaacson's biography on Einstein helped me understand the fundamentals of relativity and gave me the language + a brief enough understanding to figure out more.

Isaacson's biography on Einstein helped me understand the fundamentals of relativity and gave me the language + a brief enough understanding to figure out more. I highly recommend. It's also just a great read all around. He has a chapter called 'Einstein's God' and it cleared up some misconceptions I had about what Einstein believed about the supernatural and religion.