Node.js lets you easily build networked software (websites, applications "apps" using JavaScript).
Node.js is not "point-and-click" like WordPress, SquareSpace or Salesforce.com; you will need to write some "code". But as I will demonstrate, that's a lot easier than it sounds (if you're new to writing code), gives you more power/flexibility and puts you in full control.
The node.js ("core") has many useful modules.
Bookmark: http://nodejs.org/api (you will come back to it)
If you have never written any code of any sort before, I recommend you starting with: http://gitbookio.gitbooks.io/javascript/ You need to have JavaScript basics to make the most of Node.js