Plain-English explainers on how the internet actually breaks.
DNS propagation isn't a thing — here's what's actually happening
The phrase 'DNS propagation' is misleading. There's no synchronous global update. What you're actually waiting for is a million independent caches to expire — and that timing depends on choices made by you, your registrar, and every resolver in between.
Is it down for everyone, or just you? A 60-second diagnostic
A clean three-way split for diagnosing whether a website is genuinely down or only broken for you. Probe, status page, network isolation — in that order.
Reading an HTTP redirect chain — the underrated debugging skill
When 'is the site down' turns out to be 'the site is fine, but the redirect chain is sending users somewhere unexpected,' the only useful diagnostic is the full hop-by-hop trail. Here's what each step tells you, and the patterns that crop up most often.
Reading HTTP status codes: a non-developer's guide
The five-class shortcut for HTTP status codes (1xx-5xx), the seven specific codes worth knowing, and how to triage what each one means in practice.