how to git fetch from another branch code example

Example 1: git pull on another branch

git fetch origin master:master

Example 2: what does git fetch do

The git fetch command downloads commits, files, and refs from a
remote repository into your local repo. Fetching is what you do
when you want to see what everybody else has been working on.
... When downloading content from a remote repo,
git pull and git fetch commands are available to accomplish
the task.