github.com New repository

Create a new repository on the command line

echo "# repository_name" >> README.md
git init
git add README.md
git commit -m "first commit"
git branch -M main
git remote add origin git@github.com:[Owner]/[repository_name].git
git push -u origin main

Push an existing repository from the command line

git remote add origin git@github.com:[Owner]/[repository_name].git
git branch -M main
git push -u origin main