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What Is Prompt Engineering and Why Does It Matter?

System prompts, examples and step-by-step prompts, and why none of them is a security boundary

Chady's avatar
Chady
Jun 30, 2026
∙ Paid

In this post, I want to explain prompt engineering: what it is, the main techniques, and where it stops helping. Prompt engineering means writing the input to an LLM so you get a better and more reliable answer. The model is not a person and does not know what you meant. It predicts text from patterns, so the exact words you write change the result.

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