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.
Why SSRF Is Still Critical in 2026
Every URL parameter where the server fetches. Cloud metadata turned SSRF from inconvenience to catastrophe.
Why XSS Persists — Context Is Everything
Framework defaults cover one HTML context. Every other context — URL, CSS, JSON-in-script — is fresh attack surface.
File Upload — Three Attacks in One
Upload = attack at parsing + storage + serving. All three have their own rules, and mistakes compound.
APIs — Your Mobile App Is Public Attack Surface
Every endpoint your mobile or SPA calls is exposed to the internet. Shadow endpoints, version drift, mass assignment.
Session Tokens — Where Auth Bugs Live After Login
Developers focus on login; attackers target sessions. Theft, rotation, revocation, and the edge cases that break.
The Framework-Assumption Gap
'The framework handles it' is the most dangerous phrase in modern web security. Escape hatches, third-party integrations, and non-REST transports.
BGP Security and RPKI — How the Internet Trusts Itself, and Why It Sometimes Should Not
BGP is the routing protocol of the Internet — every ISP, hyperscaler, and large enterprise speaks it. It assumes good behaviour by every participant; that assumption fails several times a year, and we get prefix hijacks, route leaks, and accidental outages. RPKI cryptographically
Microsoft Entra ID Security
Roles, attack patterns (token theft, AitM, consent phishing), Conditional Access, PIM, hybrid AD considerations.
Azure Resource Hardening
RBAC hierarchy, network security, Storage/SQL/KeyVault hardening, Defender for Cloud, common misconfigurations.
Microsoft 365 Security
Exchange + SharePoint + Teams + Power Platform hardening, Defender stack, Purview, IR in M365.
Practitioners who've
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Each lesson is authored by someone who has shipped the control or run the engagement in production.
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