how to use .git to push code to github code example

Example 1: upload new repo to git

echo "# Can-I-Shop-2" >> README.md
git init
git add .
git commit -m "first commit"
git remote add origin https://github.com/username/projectname.git
git push -u origin master

Example 2: pushing to github

git add .
git commit -m "First commit"
git push origin master