curriculum

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.

Pro lesson

The rest of this lesson is in Pro.

Create a free account to read every free lesson and save your progress — then upgrade when you're ready for the rest.

You're reading as a guest — progress saves to this device only.

Dashboard/Module 3/Lesson 1

ProSingle-file edits

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.

Pro lesson

The rest of this lesson is in Pro.

Create a free account to read every free lesson and save your progress — then upgrade when you're ready for the rest.

Study Progress

0 / 40

lessons

In this module

Single-file edits

Reading a diff5m
Accepting and editing edits3m
Asking for explanations2m
Small refactors5m
Module 3 recap2m

Take the checkpoint