As far as flavors of Linux, I would honestly recommend using VirtualBox while on Windows. You can download a preconfigured VM of just about any Linux distro or download whatever iso you want and install in a VM. This gives you some freedom to play around and break things (and you probably will at least once) and get more familiar with the different desktop environments, software installation, command line, searching for how to do things etc.
So she can’t promote the book because it will cause “immediate and irrepairable loss”, but this ruling had nothing to do with the publisher and the book is still available for sale (or download) everywhere.
I wouldn’t have read this without the publicity about this case, so if this wasn’t a shady attempt to force a Streisand-effect for a sales boost then I hope it creates one and everyone reads it just because they don’t want us to!