# New local repository
git init
git add .
git commit -m "Initial commit"

# New remote repository
# Create remote repository (likely on github), then:
git remote add origin https://github.com/username/new_repo #https
git remote add origin git@github.com:username/new_repo #ssh
# Now push
git push -u origin master

below is used to a add a new remote:

git remote add origin git@github.com:User/UserRepo.git
below is used to change the url of an existing remote repository:

git remote set-url origin git@github.com:User/UserRepo.git

$ git clone <repo>
$ touch test
$ git add test
$ git commit -m "Initial commit"
$ git push origin main