This book is for a mixture of people, from the new and inexperienced, to the old and grumpy (like me).
It aims to teach you the basics of what you need to know to get started, while also introducing some real-world examples and suggesting various tips and tricks that you may not know already.
Even if you've been using Linux for a couple of decades, I hope you'll find something in this book that you didn't know, or find enlightening.