How to push a new local branch to a remote repository
You can push a local created branch to the repository for the first time with
git push origin HEAD
How to remove a local branch
git branch -d branchName
How to delete remote branch
git push origin :banchName
Yes, it is weird and not user friendly.
How to revert commits (uncommit)
Note: this will also remove commits from git. Find the commit you want to be the most recent one and copy its hash by reading the logs:
git log
The hash is something like 6e1cd6739f61746c66eec6580852b920b80a6bc8. Then use reset:
git reset pasteTheHashHere