Guides
Practical, in-depth guides written for IT technicians, sysadmins and network engineers — the kind of reference you'd want open in another tab while working.
How to Calculate Subnets: A Step-by-Step Guide
Network address, broadcast address, usable host range and CIDR notation — explained with two fully worked examples.
Password Security Basics: What Actually Makes a Password Strong
Why complex-looking passwords aren't actually strong, how cracking works, and what genuinely improves security.
Windows Event IDs Every IT Technician Should Know
The Security and System event IDs that come up constantly in real support work, and a practical troubleshooting workflow.
Understanding Base64 and PowerShell -EncodedCommand
What Base64 actually does, how to spot it, and the UTF-16LE gotcha that trips people up decoding PowerShell commands.
SPF, DKIM and DMARC Explained
How these three DNS records work together to stop email spoofing, with real record examples and common mistakes.
Regex Cheat Sheet for Sysadmins and Developers
Core syntax, real-world patterns for IT work, and the mistakes that trip people up most.
How to Verify File Integrity with Checksums
What a checksum actually proves, how hashing works, and MD5 vs SHA-1 vs SHA-256 vs SHA-512 guidance.