Don't think you're ready to be an open source contributor? You're wrong.
What should I do?
So you want to help - but where should you start?
How to submit a pull request using GitHub
GitHub Notifications 101
So you're now using GitHub, and it's notifying you. What now?
Setting up your environment
How to get your system setup to contribute
Confused about what something is? We've described a number of things here
There are many more resources for first time contributors