...or create a new repository on the command line

echo "# React-Self-Study" >> README.md
git init
git add README.md
git commit -m "first commit"
git branch -M master
git remote add origin https://github.com/bgoonz/React-Self-Study.git
git push -u origin master

...or push an existing repository from the command line

git remote add origin https://github.com/bgoonz/React-Self-Study.git
git branch -M master
git push -u origin master

...or import code from another repository

You can initialize this repository with code from a Subversion, Mercurial, or TFS project.