Einstein&#x27;s original book is a good read.  For quantum mechanics I recommend Feynman&#x27;s QED.  Wiki has some decent articles too.   <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Introduction_to_general_relativity" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Introduction_to_general_relati...</a>