Cybersecurity, learned like a practitioner.
24 learning paths · 398 modules live · every lesson written by someone who has shipped the control or run the engagement. Free to start.
Latest modules
Most recent practitioner playbooks across every track. Filter by topic, level, or search in the sidebar.
VPN Appliances — The Crown Jewel
Ivanti, Fortinet, Citrix, Palo Alto — every year a critical CVE. Patching speed vs attacker speed.
BGP, DNS, CAs — Internet-Scale Trust Failures
BGP hijack + DNS poisoning + TLS cert abuse = traffic interception at scale. Real breaches, real tools.
OT / ICS at the Network Layer
Stuxnet, Industroyer, Triton, Oldsmar. Why PLCs reachable from IT is catastrophic and common.
Wireless — The Perimeter That Moves
Evil Twin, KRACK, PMKID, rogue 802.1X, BLE. $40 of hardware extends the perimeter past the building.
Why Network Detection Underperforms
Encrypted traffic, volume overload, alert fatigue. Why attacker dwell time is weeks to months on average.
The Network Is Never Flat
Segmentation on paper vs reality. Every network has exceptions attackers exploit for lateral movement.
Trust Boundaries — Where Every Web Vuln Begins
Every web vuln is a trust-boundary bug. Learn to see boundaries before learning to exploit them.
Why Injection Still Happens — A Grammar Problem
Injection isn't about bad input. It's attackers smuggling tokens into an interpreter's grammar.
Why Auth Checks Fail — Missing Gates Everywhere
Authentication is one gate. Authorization is every gate after. Most breaches live in the latter.
Business Logic — Where Scanners Fail
Business logic bugs are legal sequences of actions producing illegal outcomes. Understand the product to find them.
Practitioners who've
shipped the controls.
Every module is written by someone who has built the defence or run the engagement. No repackaged tutorials, no generic theory.
Why learn here
Practitioner-written.
Each lesson is authored by someone who has shipped the control or run the engagement in production.
Quiz after every module.
20+ questions with explanations. 70%+ to mark complete. Unlimited retries.
Progress tracked.
Completions, scores and streaks saved automatically. Resume exactly where you left off.
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