What book or resource on Windows 10 made things "click" for you? Favorites and recommendations?

I had an old rental textbook for a class on Windows 7 back in college that really opened Windows up for me, and I've long since forgotten the name. I'm looking to refresh myself on Windows 10, so I'm wondering if there are any stand-out titles that have helped you guys figure out some of the little-known features of the OS. What do you guys think?