https://www.tutorialspoint.com/nodejs/nodejs_quick_guide.htm,
I was quite familiar with js, so I used node very arbitrarily, though I had a book, but it explains in a different way, this one is an EN tutorial, to get to know Nodejs in several minutes, event emitter, child_process etc,
any time, when you've gotta to get up and try, you should at least prepare for it,