The discussion centers on the book "Gravitation" by Kip Thorne and John Wheeler, which is characterized as a technical textbook on general relativity (GR). Participants rate its difficulty around 4 out of 5, indicating it is quite challenging. Other notable GR textbooks mentioned include "Gravitation" by Misner, Thorne, and Wheeler (MTW), which is also considered difficult but valuable for reference. Wald's textbook is discussed as being terse and less pedagogical, yet rich in unique content. PAM Dirac's "General Relativity" is noted as particularly challenging. Carroll's graduate text is highlighted for its accessibility compared to Wald's. The conversation reflects a shared appreciation for these complex works, with some humor about the difficulty of exercises in Wald's book. Overall, the thread emphasizes the rigorous nature of studying general relativity through these texts.