Creating a new repository on the command line

touch README.md
git init
git checkout -b main
git add README.md
git commit -m "first commit"
git remote add origin https://git.ferix.dev/f/empty.git
git push -u origin main

Pushing an existing repository from the command line

git remote add origin https://git.ferix.dev/f/empty.git
git push -u origin main