Okay. This book is a little dated, but I purchased it for under a dollar at a going-out-of-business sale of our local Half Price Books store. And it helped me orient myself towards the most recent Long-Term Support (LTS) of Ubuntu (version 16.04, Xenial Xerxes) which I have installed on a fifteen-year-old laptop.
For most tasks, Ubuntu is as easy and intuitive to learn and use as Windows or Apple operating systems. And Linux, of which Ubuntu is a "flavor" of, is quite safe, since 1) there are so few Linux machines out there running Ubuntu, and 2) Ubuntu updates it's core OS frequently, with thousands of programmers crawling through the open-source code to locate vulnerabilities, making it more secure than Microsoft of Apple's offerings, which are proprietary and closed-source.
And best of all, Ubuntu is FREE.
That said, Linux is far from Shangrala. There are drawbacks. To do some things that you can do on a PC or Mac easily, like install an Apache/ MySQL/ PHP stack to develop a test server, you'll need to use the command-line, called "terminal" in Linux. And the syntax is loads different than the Microsoft commands most techies are used to.
That's where this book was invaluable. Because it highlights the basic syntax of core tasks you'll need to do in order to succeed in running a Linux machine. And even where the syntax has changed, you'll understand enough about the basic terminal syntax, and what Linux can do, to Google a look at the current code.
Three stars. It didn't knock my socks off, but it familiarized me with the basics.