This is a website where one can find Good First Issue of a particular git-hub repository. It has features like filtering out Documention, Good First Issues and many more. Will add a few features in the future.
Firstly to start contributing for any project or opensource program you need to Fork the repository first. After forking clone the repo on your local machine. This will help you to make changes and review it personally.
To clone : git clone https://github.com/{your_username}/{repository}
Here in this case the repository will be FirstContrib.
After Cloning you can contribute via Issues or make PRs