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Six free courses. Six domains of cybersecurity. Your first 72 hours of professional training, on us. No credit card. No catch.
The geological core of your digital world. Data is the bedrock everything else sits on. If the core is compromised, nothing above it matters.
The vast oceans surrounding your digital continent. Every exposed port, every open service, every forgotten endpoint is a wave that can erode your defenses.
The terrain of your digital landscape. Baselines, configurations, and daily operations that determine whether your defenses stand or fall.
The civilization built on your digital terrain. Who gets in, what they can touch, and how trust is established, verified, and revoked.
The atmosphere above your civilization. Threats move through it constantly. Detection, intelligence, and active defense keep the skies clear.
The outermost layer: the strategic view from orbit. Risk quantification, governance frameworks, regulatory compliance, and assurance that everything below is functioning as intended.
Domain Zero is designed for career changers and beginners. If you already work in cybersecurity, jump straight to the catalog and find your certification level.
CDA organizes all of cybersecurity into six concentric domains, modeled on how a planet is protected: from the geological core (your data) through oceans, terrain, civilization, atmosphere, and outer space (governance). Every course, certification, and mission maps to this model.
Learn more in the Foundation course