Cybersecurity is the practice of protecting systems, networks, and data from harm. This page explains what that means, then shows how the NIST SP 800-53 Revision 5 security controls give you a proven way to protect your environment. When you are ready to go deeper, the Academy teaches all 20 control families for free.
Cybersecurity is the work of protecting computers, networks, applications, and data from theft, damage, and disruption. It covers the technology you use, the processes you follow, and the way people behave. Strong security is the result of all three working together, not any single tool.
Security professionals often describe the goal with three words: confidentiality, integrity, and availability. Confidentiality means only the right people can see your information. Integrity means your information stays correct and is changed only in approved ways. Availability means your systems keep running when you need them. Every control you will study serves at least one of these three goals.
Organizations of every size face the same broad categories of threat. A control framework helps you address them in a planned way instead of reacting after damage is done.
NIST Special Publication 800-53 is a catalog of security and privacy controls published by the National Institute of Standards and Technology. It lists the safeguards an organization can put in place to protect its systems and the information they hold. Federal agencies are required to use it, and many private companies adopt it because it is thorough and widely respected.
Revision 5 is the current edition. It reorganized the catalog around outcomes, folded privacy into the same set of controls, and added families for program management, personal data handling, and supply chain risk. The controls are grouped into 20 families. Each family covers one area of security, and each control within a family states a specific safeguard along with guidance on how to apply it.
You do not have to apply every control to every system. Organizations select a baseline based on how sensitive a system is, then tailor it to fit their needs. The Academy teaches the families and controls so you can make those decisions with confidence.
These five steps turn the catalog into a plan you can follow. Each one connects to controls you will study in the Academy.
Inventory your systems, data, and the people who use them. You cannot protect what you have not identified.
Decide how sensitive each system is and what would happen if it were compromised. This sets your baseline.
Put the right safeguards in place across the 20 families, from access control to supply chain risk.
Check that the controls work as intended, document the results, and approve the system to operate.
Watch for changes and new threats, review controls over time, and fix weaknesses as they appear.
These are the 20 families in NIST SP 800-53 Rev 5. Every control in the catalog belongs to one of them. The Academy has a full track for each.
The Academy turns each family into short lessons, hands-on labs, and quizzes. Start with any family, track your progress, and earn a certificate you can verify. It is free for every learner.