(If you are a front-end programmer who doesn't know dynamic programming languages ??like PHP, Python, or Ruby, and want to create your own services, then Node.js is a very good choice. Node.js is JavaScript that runs on the server side, if you are familiar with Javascript then you will learn Node.js easily. Of course, if you are a back-end programmer and want to deploy some high-performance services, then learning Node.js is also a very good choice.)