I'm Confused!!

Hey Guys and Gals! Let Me Begin by Saying That I Am Totally in Love with This Forum! I've Never Beheld Such a Brilliant Cornucopia of People to Date! I Want So Badly to Refer My Friends to This Site but I Don't Want to Share You! I'm Selfish... I Know. Smh. Now That I Have That I Have Aired My Thoughts. Recently, I've Purchased Several Books in an Attempt to Gain More Perspective on Kali Linux. Master OTW Does a Brilliant Job of Teaching. As a Result, I Took His Advice to Research As Many Avenues as Possible to Learn as Much as Possible. Which Leads Me to My Next Question. Which Books Do "YOU" Suggest a Person Should Read to Help Them Develop There Skills as a Pen-Tester? The Books I Presently Have Are the Following...

Mastering Kali Linux for Advanced Penetration Testing--

Basic Security Testing with Kali Linux--

Metasploitable the Pen-Tester's Guide--

Penetration Testing A Hands-on Introduction to Hacking--

Would you say that I am starting in the right direction or do you suggest something different? I appreciate any and all feedback.

Please, do tell :)