Reading Hartle's book on general relativity is best approached after gaining a solid understanding of special relativity (SR). While Hartle does cover SR, prior exposure is essential for grasping concepts effectively, particularly the manipulation of Lorentz factors and the 4-vector formulation. The discussion highlights the recommendation of starting with "Spacetime Physics," especially the first edition, as a foundational text. Additionally, "A Traveller's Guide to Spacetime" is noted as an excellent resource, alongside "Spacetime Physics" and a book by French, indicating a preference for texts that provide exercises and solutions to reinforce learning.