githu change branch in commanline code example

Example 1: git change branch

git checkout <<branchName>>

Example 2: change branch git

- git checkout xyz =
                checks out the branch, switches to the branch.
- git checkout -b <branch_name> =
                creates a new branch and switches to it.
- git merge <branch_name> =
                this command takes changes from the given branch,
                and merges with the current branches we are on.