PlainlySec Team 
A deep dive into the most common Active Directory attacks — Kerberoasting, Pass-the-Hash, DCSync, and BloodHound — with real commands for both attackers and defenders.
How DarkSide ransomware shut down the largest US fuel pipeline using one compromised password — the complete timeline, technical analysis, and prevention lessons.
Step-by-step Linux hardening guide covering SSH configuration, firewall rules, kernel parameters, user permissions, and audit logging — with copy-paste commands for every step.
A detailed breakdown of the SolarWinds supply chain attack — the exact timeline, techniques used by APT29, what organizations could have done differently, and detection methods.
A detailed walkthrough of how a Security Operations Center detects, investigates, and responds to phishing attacks — with specific tools, commands, and decision points.
A comprehensive guide to the best free open-source cybersecurity tools — from Nmap to Wazuh — with real commands, use cases, and home lab tips.
Capture the Flag competitions are the best way to legally practice hacking skills. This beginner’s guide explains what CTFs are, the categories you’ll encounter, and the free platforms to start learning today.
Vulnerability management is the process of continuously finding, prioritizing, and fixing security weaknesses. Learn how to set up a vulnerability management program using free tools like OpenVAS and Nessus Essentials.
MFA stops 99.9% of automated account attacks. This guide covers every type of MFA — from SMS codes to hardware keys — explains the security tradeoffs, and shows you how to roll it out across your organization.
Not all VPNs are created equal. This guide compares WireGuard and OpenVPN, explains when to use each, and walks you through setting up your own private VPN server — without trusting a commercial VPN provider.