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Updating code on branch

Creating your own branch for a new feature/bugfix

$ git remote -v (To check if you have a local fork and a upstream set up) 
$ git checkout -b <branch-name> (this creates a new branch)
$ git branch  (To make sure you are working on the desired branch)
$ git add <file_name> (stage all your files)
$ git commit -s (or -m)
$ git push --set-upstream origin <branch_name>

updating your PR

$ git branch (To make sure you are working on the desired branch)
$ git checkout <branch-name>
$ git add <file_name>
$ git commit --amend

Add your commit message with whatever changes you have made and save it and push it to your branch

$ git push origin <branch-name> --force