Test SSH Connection
ssh -vT git@github.com
Show URL
git remote show origin
Set URL
git remote set-url origin git+ssh://git@github.com/username/repo-name.git
Add a Remote
git remote -v
git remote add upstream https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY.git
git remote -v
Sync with Remote
git fetch upstream
git checkout main
git merge upstream/main
git push