1. Starting with NodeJS

What is NodeJS

NodeJS is a JavaScript-libery for writing high scalable network programs. That means that many client connections can be handled concurrently. E.g. You can write a simple webserver easily:

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(1337, "127.0.0.1");

For more information see: http://nodejs.org/