Hacker Techniques, Tools, and Incident Handling 3rd OE. Professionally spiraled and resold by a third party. This spiraled book is not necessarily affiliated with, endorsed by, or authorized by the publisher, distributor, or author.
A basic introduction, but not much more than basic. Also, the quizzes at the end of each chapter are full of errors. Required for my Ethical Hacking class, but sites like TryHackMe have taught me a lot more practical skills.