How do you delete branches in GitHub?

Question

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Tell me what the following commands do and how they work:
1)git branch --delete branch name
2)git branch -d branch name
3)git push origin --delete branch name
4)git push --delete origin branch name
Thanks

Answer 1

Firstly, not in github, but in git. Next:
1. Deletes the local branch
2. Same as 1.
3. Deletes the remote branch in the repository.
4. Perhaps the same as 3
But how they work has already been suggested to you in the comments.