6 books • 7 series
Linux for Beginners (37 Linux Commands You Must Know, #2) (How to Install the Linux OS, #1)
Ethical Hacking for Beginners (Pre-Engagement Process Execution, #1) (How to Build Your Pen Test Lab Fast, #1)
Cybersecurity for Beginners (How to Get a Job in Cybersecurity, #2) (2 Manuscripts, #3) (What You Must Know about Cybersecurity, #1)