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infrastructure/environment-variables-how-the-same-code-talks-to-a-practice-database-o.md
Environment variables: how the same code talks to a practice database on your laptop and the real one online
The same program can talk to a practice database on your laptop and the real one on a live website, without a single edit to its code. The…
infrastructure/from-localhost-to-production-what-deploying-your-code-really-means.md
From localhost to production: what “deploying” your code really means
Your app runs perfectly at localhost:3000, but the link does nothing on a friend's phone. That's because localhost means "this computer"…