How do I create a new Git branch from an old commit?

Question

I have a Git branch called jzbranch and have an old commit id: a9c146a09505837ec03b.

How do I create a new branch, justin, from the information listed above?

Answer 1

To create a new branch called 'justin' and check it out

$ git checkout -b justin a9c146a09505837ec03b

To create the branch without checking it out

$ git branch justin a9c146a09505837ec03b