Whether you read the PDF notes or the book, here is the "Theoretical Minimum" path for GR that Susskind lays out:
The concept of a "Theoretical Minimum" for General Relativity (GR) stems from Leonard Susskind's famous series designed to provide the core mathematical and physical toolkit required to actually do physics, rather than just read about it. the theoretical minimum general relativity pdf
Special Relativity (time dilation and Lorentz transformations). Whether you read the PDF notes or the
The series started as a set of continuing education courses at Stanford University. Susskind’s goal was to provide the "minimum" amount of theory required to actually do physics, rather than just talk about it. rather than just talk about it.