I think this book may be useful for people more familiar with the subject.I hoped to understand TPM command to encrypt/decrypt the data/key but find the book hard to read. There are several examples in C but those are evasive and leave me with more questions and doubt. I gave up after several chapters

To be fair, I attempted to read TCG specs (and there are so many!) as well and those were equally confusing to me and it is difficult to satisfy all aspects of TPM. I have more understanding of TPM after reading several chapters but my original questions remained unanswered.