The library

One distinction per article. The difference, the rule, and when to use each — written for people who'd rather understand a thing once than google it every six months.

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AI engineering

Why grep loses and a graph wins

Ask an assistant to rename a function and it will search for the name. That sounds reasonable until you notice it has answered a completely different question from the one you asked.

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The harness is the product, not the model

Two people used the same AI on the same day. One got a working pull request, the other got confident nonsense. Nothing about the model was different.

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Why your CLAUDE.md gets ignored

You wrote the rules down and the model broke them anyway. That's not the model being stupid — it's the file being unreadable.

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Databases

Redis vs Postgres

Your app needs to remember things. But 'remember' is two different jobs.

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Security

Hashing vs Encryption

If you encrypt passwords, you've already lost. Here's why.

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Cookies vs localStorage

Where is your JWT right now? If the answer is localStorage, any script on your page can read it.

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More on the way

There are 37 of these built for the feed — TCP vs UDP, containers vs VMs, processes vs threads, stack vs heap, authentication vs authorisation, merge vs rebase, and the rest. They're being written up properly one at a time, best-performing first.

Want one sooner? It's usually the one you're arguing about at work.