Fork the repository and then clone it locally by doing -
git clone https://github.com/gamingboots/Hello-World.git
Start your magic by modifying the code and making changes of your own. Then push the commit using -
git add .
git commit -m "<your commit message here>"
git push YOUR_REPO_URL develop
After cloning & setting up the local project you can push the changes to your github fork and make a pull request.
Contributions are always welcomed :D