What is the correct way to create a sub-branch under a branch in git?

Question

What is the correct way for git to create a sub-branch under a branch

Answer 1

Two steps

#切换到分支
git checkout branch1

#基于该分支创建子分支
git checkout -b branch2_based_on_b1 branch1 

Answer 2

checkout -b

Answer 3

git checkout -b new branch name old branch name (this way of writing means creating a new branch based on the old branch)