Foundations
What is Encapsulate What Varies?
Pull the parts of your code that change into their own modules. Leave the stable parts alone.
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In real work
Encapsulate what varies: we pulled payment providers into their own module so adding Stripe does not touch checkout UI.
How is this different from Googling it?
Google gives a definition. Prompthaus pairs each term with how it shows up in standups, PRs, prompts, and design reviews—then quizzes you until the word sticks. One term a day on iPhone.