This is the source code for the Node.js tutorial at http://blog.akademy.co.uk/2014/06/node-js-the-programmers-save-the-world-tutorial/ . Maybe you'll find it a fun way to learn node.js.
It's for learning some of the basics of node.js:
- Running a server
- Responding with different content
- Installing a package with NPM
- Creating code that will run on both servers and clients
- Sockets.io communication
- And maybe saving the Earth.