The CIA Triad is one of the most important concepts when it comes to Cyber Security. Many compliance and regulatory frameworks link back to the Confidentiality, Integrity, and Availability of the CIA Triad. A good understanding of the three components will help you in protecting networks as well as being able to communicate the link between security components and business objectives.
CISSP Resources
Official CISSP CBK: https://amzn.to/2THCPhy
Official CISSP Study Guide: https://amzn.to/369BT7Z
Eleventh Hour CISSP: https://amzn.to/2Rfavl4
Security+ Resources
CompTIA Security+ Study Guide: https://amzn.to/36egURI
DISCLAIMER: I am an ambassador or affiliate for many of the brands referenced. As an Amazon Associate, I earn a commission from qualifying purchases.