git checkout -b

Create a new branch:

git branch new_branch 
git checkout new_branch

git checkout -b YOUR_NEW_BRANCH_NAME
Switched to a new branch 'YOUR_NEW_BRANCH_NAME'

git checkout -b "Name with spaces"
fatal: 'Name with spaces' is not a valid branch name.

See also

• git checkout [ -b | master | main | -f ]
• git branch, git: upstream, git branch --delete branch name, [ --list | -a | -r | -M ]