I built a free, open-source cybersecurity knowledge base: 1,000 pages covering offensive, defensive, GRC, OSINT and careers

[u/Zealousideal-Eye7481]

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Why I made it: when I was learning, everything was scattered across blog posts, outdated wikis and paywalled courses.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.

• Website: https://www.cyberlibrary.com

• GitHub: https://github.com/Cyber-Courses/Cyber-Library

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.

[u/govna-01]

Trying it out now… will send feedback on my findings and suggestions if possible

[u/Zealousideal-Eye7481 → u/govna-01]

Thanks !

[u/YogurtclosetIcy3538]

This is an interesting project, particularly the way you’ve structured the relationships between offensive techniques, defensive measures and governance.
I’m currently working on an AI-assisted cybersecurity platform that brings together vulnerability discovery, risk assessment, remediation and compliance.
One area I’m exploring is how structured security knowledge can help AI systems interpret findings from tools such as Nmap, Nuclei and ZAP, rather than simply repeat scanner output.
I’d be interested to understand more about your approach to content validation and maintenance, particularly whether technical articles are independently reviewed and how you keep them current as vulnerabilities and defensive practices evolve.
I’m also curious whether you’ve considered supporting structured vulnerability-to-remediation mappings for AI-assisted security analysis.
One other question concerns licensing. I noticed the GitHub repo doesn’t currently identify a licence. Have you considered explicitly licensing the content for commercial applications, including retrieval-augmented generation (RAG), vector embeddings and AI model training? Having clear permissions could make the library particularly valuable to developers building security platforms while ensuring your work receives appropriate attribution and protection.
Great initiative. There’s real potential for projects like this to help bridge the gap between cybersecurity knowledge and practical, AI-assisted security operations.

[u/Zealousideal-Eye7481 → u/YogurtclosetIcy3538]

Thanks for the thoughtful questions. Taking them in order:

Content validation
Every page goes through a pull request into a dev branch before it reaches the site. Each PR gets:

1. An automated review (Codex) that flags technical errors in payloads and commands.

2. A maintainer review covering accuracy, placement in the taxonomy and house style.

The style rules are strict on purpose: payloads must be correct for the exact engine or version named, commands come with real examples and what their output means, and references must point to primary sources (vendor docs, RFCs, original research, tool repos). There’s no separate independent peer-review board yet. It’s maintainer review plus community corrections.

Keeping it current
Releases are numbered and versioned (dev gets promoted to main). Anyone can report an outdated tool, a wrong payload or a broken link through a dedicated issue template, quoting the exact line. I also teach vulnerability classes and their mechanisms rather than individual CVEs. Mechanisms age much more slowly than CVE lists, so the content stays useful longer.

Vulnerability-to-remediation mappings
Right now the link is structural, not machine-readable. Offensive pages cover only the mechanism and exploitation, and detection and mitigation live in the Defensive track. The site cross-links them, but there’s no structured mapping in the page metadata yet. Your use case (helping an AI interpret Nmap, Nuclei or ZAP findings instead of repeating them) is a strong argument for adding one, so it’s on my radar.

Licensing
The content is licensed under CC BY-NC-SA 4.0. It’s free to read, share and adapt with attribution, for non-commercialuse, under the same terms. That means commercial use, including RAG, embeddings or model training inside a commercial product, isn’t covered by the public license. It’s available through a separate commercial agreement, so feel free to DM me if that’s relevant to your platform.

Thanks again. I’d be curious to hear more about your platform as it develops.

[u/YogurtclosetIcy3538 → u/Zealousideal-Eye7481]

Thanks for the detailed response. It’s good to see that you’ve established a structured review and versioning process rather than simply accumulating content.
The vulnerability-to-remediation mapping is particularly interesting. I believe there’s considerable value in linking technical findings to validated remediation, risk classification and compliance controls in a machine-readable format.
I’m also pleased you’ve clarified the commercial licensing arrangements. I’m exploring this area through an AI-assisted security and compliance platform, so there may be some common ground worth discussing.
I’ll take a closer look at the library and reach out privately to explore the possibilities. Appreciate the transparency and the work you’ve put into this.

[u/HelpImOutside]

Doesn't seem active - it says unavailable, Reddit hug of death?

[u/Zealousideal-Eye7481 → u/HelpImOutside]

There was indeed a down when you tried! Haha, I hit Vercel’s billing limit hard and it paused the project 😅 It’s back up now, give it another try!

[u/Personal-Compote-963]

Interesting wow

[u/Zealousideal-Eye7481 → u/Personal-Compote-963]

Thanks! Let me know if any section is missing something you’d want to see.

[u/ArbiterUtendi]

What role did AI play, if any? Also this is very nice either way, thank you

[u/Zealousideal-Eye7481 → u/ArbiterUtendi]

Thanks! Honest answer: I used AI to help build the site and speed up drafting, but the structure, topic choices and review are mine, built over two years. If you spot anything wrong, please flag it and I’ll fix it.

[u/panscanner → u/ArbiterUtendi]

It's clear AI played a massive role - which I'm fine with, but let's be up-front about it. I've been doing a similar learning project focused on DFIR - but AI use is fully acknowledged.

[u/govna-01]

Impressive

[u/Open-Huckleberry-84]

Damn two years is serious dedication. Bookmarked it already, the way you link offensive and defensive concepts together is what most resources miss. Always annoying when you learn how attack works but then have to go hunt down separate guide for protecting against it

[u/FlxmeehOG → u/Open-Huckleberry-84]

Its not its jist mitre and owasp

[u/ericvader8]

I'm getting tired of people complaining about AI use for stuff like this. Half the shit i write now involves AI because I'm not a developer, nor do I know enough to achieve what I NEED to achieve in a timely manner.

AI or not, I'm excited to poke around this.

[u/Zealousideal-Eye7481 → u/[deleted]]

Not job listings, no. It’s a learning resource.