how to switch to an already existing branch in git code example

Example 1: how to swap branch git

[git checkout "branch_name"]

is another way to say:

[git checkout -b branch_name origin/branch_name]

in case "branch_name" exists only remotely.

[git checkout -b branch_name origin/branch_name] is useful in case you have multiple remotes.

Regarding [git checkout origin 'another_branch'] I'm not sure this is possible, AFAK you can do this using "fetch" command -- [git fetch origin 'another_branch']

Example 2: canging branch in git

$ git checkout <existing_branch>

$ git checkout -b <new_branch>

Example 3: sitch a branch command line

$ git branch