Git create a new branch from a h

• git branch branchName <sha1-of-commit>

# On master branch
$ git log --oneline
37f1ff2 (HEAD -> master) Add file06
fd92f0a Add file04 and file05
706ac8d (demo) Add file03
e62bfba Add file02
6dd771d Add file01

# Create a new branch named "demo01"
$ git branch demo01 706ac8d

# Checkout to demo01
$ git checkout demo01
Switched to branch 'demo01'

# Om demo01 branch
$ git log --oneline
706ac8d (HEAD -> demo01, demo) Add file03
e62bfba Add file02
6dd771d Add file01

# On master branch
$ git log --oneline
37f1ff2 (HEAD -> master) Add file06
fd92f0a Add file04 and file05
706ac8d (demo01, demo) Add file03
e62bfba Add file02
6dd771d Add file01

• git checkout -b branchName <sha1-of-commit>
  Which is equivalent to git branch branchName <sha1-of-commit> + git checkout branchName.