If you browse the log of any random git repository, you will probably find its commit messages are more or less a mess.
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The seven rules of a great git commit message:
- Separate subject from body with a blank line
- Limit the subject line to 50 characters
- Capitalize the subject line
- Do not end the subject line with a period
- Use the imperative mood in the subject line
- Wrap the body at 72 characters
- Use the body to explain what and why vs. how