Not very useful, particularly if you have ever used the internet. Nothing in is book is relevant, current or a fresh perspective. Every single line of this book can be found by going to www.google.com and typing in what you want to know. There are no clear examples given, tips, techniques or anything of value that would give the target audience a purpose for which to buy this book. I give the book a two star because I love Linux and just maybe someone who doesn't know what the internet or what google is could possibly find this book remotely useful.