Guides

Long-form explanations for practitioners — covering the failure modes and trade-offs, not just the happy path.

A token is not a word, and the difference between the two is where most LLM cost estimates go wrong. Here is how tokenizers actually split your text.

Published per-million-token prices are only half the equation. Tokenizer differences, caching, batching and reasoning tokens change the real number.

A JWT is three Base64 segments and a signature. Understanding what the signature does — and does not — prevent is the whole game.

Prompt engineering is mostly specification writing. Here is a structure that produces reliable output, and the failure patterns that break it.

Cron is five fields and a set of rules most people learn by trial and error. Here is the whole thing, including the OR rule that causes real outages.

Most regex bugs come from one thing: not knowing that the engine backtracks. Understand that and the rest follows.

One question decides it: will a human type this by hand? Everything else follows from the answer.

SQL is read far more often than written, usually by someone else, usually under time pressure. Formatting is cheap insurance.

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