Free Resources
Cybersecurity Resources
Curated links to free, authoritative cybersecurity resources — organized by category.
New · Practitioner Field Guide
Writing Agent Guardrails with Ordinance
A practitioner's framework for policies that actually constrain an AI agent — and deploying them safely, with audit evidence, in CMMC / NIST 800-171 / CUI environments.
Threat Intelligence & Frameworks
Standards & Compliance
Vulnerability & Exploit Data
Application Security
Cloud Security
Training & Hands-On Labs
Free training resources for Microsoft virtualization and security technologies.
Free courses, exercises, and resources from the U.S. cybersecurity agency.
Free online courses covering operating systems, networking, and security fundamentals.
Phaethon Guides
In-depth guides from our team
CMMC Audit Logging & Evidence: A Small Contractor's Guide (2026)
How small DIB contractors satisfy CMMC Level 2 audit logging and evidence — without shipping CUI to the cloud or standing up Splunk.
What Evidence Does a C3PAO Actually Ask For?
How CMMC Level 2 assessors gather evidence — Examine, Interview, and Test — and how to prepare a package that holds up.
Audit Log Retention for CMMC & NIST 800-171: How Long, and Why
What the requirements actually say about retention, the 90-day DFARS incident rule, and how to protect and review logs so they hold up at assessment.