As we already know, Node.js is not just another language, but JavaScript. The language syntax and tools you used while coding JavaScript on the browser will work verbatim on the server. Node.js has additional tools that are only available on the server, but the language and syntax are again the same as JavaScript. I'm assuming you have a general understanding of the basic JavaScript syntax, but I will introduce JavaScript to you with a very brief primer on the language, just in case.
In general, JavaScript is a fairly simple language when it comes to syntax, and you only need to know a few important elements.