How do I use Node

I have seen many projects with nodejs being used(server side) and I wanted to know how do I use it. I literally know nothing how to use it. If anyone can help me right from the beginning I would really appreciate it.
Also if I had to create an online/web file system which can save, retrive and update files would Node take money for server space and usage.

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CodingElf66, that is a great tutorial to get you started on NodeJS. On Replit, unless if you buy a plan, everything is actually free, so no. (If you don't enter your credit data, then of course not!)


@ionX Np, you can mark it as answered!