So buy the book? The expectation of free stuff is all too common.
Judging by the publisher's sample,[1] the second edition (2025) looked like a worthwhile upgrade, so I ordered it. Much of the material is in the manpages, but this presents it with better explanations.
___
1. <https://ptgmedia.pearsoncmg.com/images/9780135325520/samplep...>
This one is good as well.