Here we take clearing the entire commit history of the main branch as the example.

1. Switch to the main branch

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git checkout main

2. Create a clean branch

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git checkout --orphan new_main

3. Commit all files

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git add -A
git commit -m "msg"

4. Delete the main branch

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git branch -D main

5. Rename the new branch to main

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git branch -m main

6. Force push to the remote repository

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git push -f origin main