I built a free, open-source cybersecurity knowledge base: 1,000 pages covering offensive, defensive, GRC, OSINT and careers
Hey everyone,
For the past two years I've been working on Cyber Library, a structured, community-maintained knowledge base for cybersecurity. It just hit its first 1,000 pages, so it felt like the right time to share it.
Why I made it: when I was learning, everything was scattered across blog posts, outdated wikis and paywalled courses. I wanted one place where topics are organized consistently and linked together, so you can go from "what is this attack" to "how do I detect and defend against it" without opening 15 tabs.
What's inside:
- Foundation: history, ethics, risk, the human side of security
- Offensive: ethical hacking, pentesting, red teaming. Each page explains the vulnerability and how it's exploited, and links to the defensive side
- Defensive: monitoring, incident response, resilience
- Governance: policy, compliance, security for leadership
- Intelligence: threat intel and OSINT
- Career: roles, skills, certifications
Free and no signup. The content is plain Markdown on GitHub, so you can read it on the site, clone it, or fix something with a PR.
I'd really appreciate feedback, especially on what's missing, what's wrong, or what you'd want covered next. And if you find it useful, a ⭐ on GitHub helps other people find it.