The classic book on General Relativity by Wheeler, Thorne and Misner is now out: https://www.amazon.com/gp/product/0691177791/ref=ox_sc_act_title_4?smid=ATVPDKIKX0DER&psc=1 I got to use preprints of the book while doing an independent study of General Relativity in 1973. It brings back fond memories of being tortured by Tensors, Levi-Cevitas, Christoffel symbols and other arcane concepts. https://en.wikipedia.org/wiki/Gravitation_(book) Make sure to read the Preface of the book before buying it. They have updated many sections (first 22 chapters are largely as is). However, there are some advanced topics that have not been updated. I couldn't find a list of them to present here. The Princeton site doesn't show the Preface information. https://press.princeton.edu/titles/11169.html Also Amazon shows many reviews and you might find something of interest there.