Learn security, one notebook at a time

337 free chapters across 47 notebooks. Start with the fundamentals and follow the roadmap to pentesting, AppSec, red team, blue team, and beyond.

Start with Linux Browse the roadmap

Foundations
Linux, networking, Windows, the web, and crypto. Everything else builds on these.
Linux10 chapters16.3 h Networking12 chapters23.4 h Windows Internals7 chapters15.5 h Active Directory Basics5 chapters13.4 h Programming for Security8 chapters22.5 h How the Web Works6 chapters17.6 h Cryptography7 chapters22.1 h Security Theory6 chapters18.3 h
Offense
Think like an attacker: methodology, exploitation, web bugs, and red team operations.
Methodology & Lab3 chapters8.5 h Recon & OSINT13 chapters42.3 h Scanning & Enumeration8 chapters30.9 h Vulnerability Assessment4 chapters16.7 h Web App Pentest4 chapters16.8 h Network Attacks8 chapters34.1 h Password Attacks6 chapters22.2 h Exploitation8 chapters27.2 h Privilege Escalation7 chapters11.3 h Active Directory12 chapters54 h Wireless6 chapters23.3 h Capstone3 chapters11.5 h Bug Bounty Foundations2 chapters6 h Web Tooling7 chapters22.8 h Injection6 chapters24.8 h Client-Side5 chapters21.3 h Access & Logic5 chapters21.3 h Server-Side8 chapters34.3 h APIs & CMS6 chapters23.8 h Social Engineering11 chapters32.1 h Malware & Evasion5 chapters16.5 h Operations9 chapters31.7 h
Defense
Detect, investigate, and respond: SOC work, forensics, threat hunting, and purple teaming.
SOC Analyst13 chapters37.8 h Detection Engineering7 chapters23.9 h DFIR8 chapters33.2 h Threat Intel & Hunting6 chapters26.8 h Purple Team4 chapters14.9 h
Specialize
Go deep on one area: reverse engineering, cloud, mobile, AI, product security, and more.
Malware Analysis & RE8 chapters33.6 h Binary Exploitation8 chapters37.3 h Cloud Security9 chapters47.9 h Mobile, IoT & Hardware10 chapters51.3 h AI/ML Security9 chapters44 h Quantum Security5 chapters27.5 h GRC & Architecture6 chapters24.1 h Product Security Foundations8 chapters31.3 h Secure Code Review9 chapters39 h Security Program7 chapters31.5 h
Career
Practice with CTFs, pick a path, and land the role.
CTF & Wargames8 chapters33.1 h Career5 chapters20.3 h