I love using Google. The ability to search out just what I wanted to know. My guess is that many of us have bookmarks to sites that we've stumbled on, that get visited every now and then. Some obscure, some not so obscure, but all useful, or at least of interest.
So I thought, why not start a thread of site links, with a brief description of what the site is about. Here's a starter:
This is a very good site about optics, among other things. What I like about it is that there is a pretty good technical level of explanation, yet it is still understandable.
I hope you get your money's worth. As I understand what I see via Amazon's "preview", only part 4 of the book is about travel photography, and a lot of that seems to be about the same old same old subjects, cliches that will already have been done by pros who are willing to wake up at or before daybreak and to carry ladders around with them.
Where are you planning to go?