SHELL

git pull origin master

git checkout my_branch    # move on your branch (make sure it exists)
git fetch origin          # fetch all changes
git pull origin master    # pull changes from the origin remote, master branch and merge them into my_branch
git push origin my_branch # push my_branch

how to git pull origin master

git pull origin

git pull origin main

to pull project from github to your local machine :
1-create a repo on  github 
2-open the repo and go to repo code , click on the green button "Code"
3-copy the link "SSH" or "HTTPS" 
4-go to your command line app on your machine 
5-run this command : git clone (Link from  step 3)
6-press Enter and you will have your project locally 
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if you alrady did that and you just want to pull the changes from your github 
just open your command line app and go to the project path or directory 
then : git pull origin main || git pull origin " any branch Name"
this will pull all changes that you don't have them locally