git aliases are useful command-line shortcuts to save a minute or two here and there while working with your version-controlled source code (or other data).
To use it, just add the following line to your `~/.gitconfig`
fb = "!git fetch origin && git checkout -t $(git symbolic-ref --short refs/remotes/origin/HEAD) -b"
git fb try/some-new-feature
`fb` is short for “feature branch“
EDITED 2020-07-21 to continue to work with repositories that have moved away from calling the default branch
master (Github is changing the default).