Transferable golfing skills

We have many questions about how to golf in a specific programming language. These result in tips that apply only to that language or closely related languages.

What advice do you have on golfing that applies more generally, to most languages? These may be algorithmic tricks or general approaches, or specific tips that happen to apply across many languages.

Please post each tip in a separate answer so voting can bring the most useful to the top.

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This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

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Transferable golfing skills

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