Reading a diff

5 min read·Lesson 1 of Single-file edits

In Module 2 you made a web page about yourself. Now you will start changing it — and the most important habit when changing a file is reading what Claude proposes before it touches anything.

When Claude changes a file, it does not silently rewrite it. It shows you a diff: a line-by-line preview of exactly what will change, and it waits for your approval. Learning to read a diff is the skill that lets you move fast and stay in control.

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