give some sources to learn more about JS.
I started with Babel's Learn ES2105, you can also use the repl to see what "old" JS it outputs.
I went on doing almost all the exercises here: es6katas.org/
If you want to go deep on specific features you can have a look here: ponyfoo.com/articles/tagged/es6-in...
This is a good example that you could get used to start understanding some of the concepts. From there google will help you understand more.
I sincerely hope you mean ECMAScript 6, because otherwise there is yet another standard I don't know about
Easy to follow free courses, that explain the WHY to write exactly this line of code.
If money isn't an issue then I found Wes Bos course learnnode.com/ to be a fitting start. It covers a wide range of topics but expects you to have a understanding of general dev and JS.
Another 'okayish' resourse is the book Node.js In action.
The book is a good introduction onto some topics, however the code examples can be a bit.. meh.
Some youtube channels that can give good insight are:
Good luck in your studies, Node.JS is fantastic IMO and I love it!
+1 for Wes Bos.
There's tonnes of resources out there, but a good read is Kyle Simpson's YDKJS series. Also, once you start feeling comfortable with some ES6 (ES2015), you can check out es6katas.org to do some daily katas.
The nodeschool tutorials are cool too! They get you started quickly and let you grasp the basics: nodeschool.io/
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