One commit should represent one useful idea
A logical commit might add one feature, fix one bug or perform one clearly scoped refactor. Avoid combining formatting changes, dependency upgrades and unrelated behavior changes in the same commit.
Why small commits help
They make code review easier, make git bisect more effective and make reverting a specific change safer. They also reduce the amount of unrelated code a reviewer has to understand.
Use the staging area intentionally
If a file contains two unrelated changes, stage only the relevant hunks with git add -p. This is one of Git's strongest features for producing clean history.
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