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how to update an existing repository in github

//:- Find & copy Central Repo URL
git remote add upstream https://github.com/username/repositoryname.git
//pull down any changes and sync the local repo with the central repo
git pull upstream main  // main is the default branch you can write your own branch name
//add changes
git add .
git commit -m "Message"
//push your changes up to your fork
git push origin master

how to update existing git repository

''' Updating on existing repository'''

//:- Find & copy Central Repo URL
git remote add upstream https://github.com/username/repositoryname.git
//pull down any changes and sync the local repo with the central repo
git pull upstream main  // main is the default branch you can write your own branch name
//add changes
git add .
git commit -m "Message"
//push your changes up to your fork
git push origin main