SANS GIAC Certification: Security Essentials Toolkit (GSEC)
GSEC GIAC Security Essentials Certification All-in-One Exam Guide
Blue Team Field Manual (BTFM) (RTFM)
Blue Team Handbook: Incident Response Edition: A condensed field guide for the Cyber Security Incident Responder.
Easy Guide: GSEC Security Essentials: Questions and Answers (Global Information Assurance Certification (GIAC)) (Volume 1)
The GSEC Prep Guide: Mastering SANS GIAC Security Essentials
Rtfm: Red Team Field Manual
Network Security Bible
CCSP Certified Cloud Security Professional All-in-One Exam Guide