HappyCoding.io is a website devoted to programming tutorials and examples.
Happy Coding is entirely open source: everything from the example code to the code that puts the actual site together. You're looking at that source code.
One of the awesome things about open source is that you can contribute. Even if you aren't an expert programmer, there are still things you can do! Read this page for more info.
Have a question? Just want to introduce yourself? Come say hi on forum.HappyCoding.io!