GUIDES
In-depth explainers on networking, security and cloud topics — one new guide a week
Written the same way the tools on this site are built — by someone who actually does this for a living, not summarised from someone else's blog post. Each guide stands on its own; the tools linked at the bottom of each one are there if you want to go apply what you just read, not the other way around.
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Server & Cloud
Why Your Cloud Bill Spirals, and How to Actually Read It
The line items that quietly dominate an AWS/Azure/GCP bill, and why the sticker price on compute is rarely the real story.
Storage
RAID Levels Explained: Which One for Which Workload
RAID 0, 1, 5, 6 and 10 aren't interchangeable choices — what each actually trades off, and how to pick based on the workload instead of habit.
Security
How CVSS Scores Actually Work — and Where They Mislead You
What the base, temporal and environmental metrics actually measure, and why a 9.8 on paper doesn't automatically mean drop everything.
Networking
Subnetting From Scratch: Planning a VLSM Addressing Scheme
How to actually think through a Variable Length Subnet Mask design instead of memorising CIDR tables — sizing subnets to fit, not just fitting subnets to a chart.
Security
SPF, DKIM & DMARC — Actually Explained
Three different email authentication records that get lumped together constantly, and what each one actually does when a message shows up in someone's inbox.