Create a git branch from (un?)committed changes

git_branch_from_changes.md

If you hadn't made any commit yet, only (1: branch) and (3: checkout) would be enough.
Or, in one command: git checkout -b newBranch.

As mentioned in the git reset man page:

1. $ git branch topic/wip    
2. $ git reset --soft HEAD~3 
     (or --hard to remove unindexed files) 
2. $ git checkout topic/wip

1. You have made some commits, but realize they were premature to be in the "master" branch. You want to continue polishing them in a topic branch, so create "topic/wip" branch off of the current HEAD.
2. Rewind the master branch to get rid of those three commits.
3. Switch to "topic/wip" branch and keep working.