I recommend the online course 'Metaspliot Unleashed' ( Link) as opposed to buying the book ( Link). Please read the reviews for the edition you want to purchase) Hacking Exposed: Linux ( I don't have a link to a specific book as there are many editions / revisions for this book. Please Note: The examples in the book are dated (even though it's been updated to v3), but this book is the best for learning Infrastructure Testing Methodology. Here's a list of reputable books, again in my opinion ( All links are Non-Affiliate Links): In my opinion every book in this bundle is a bag of shit.
