to understand which i can refer to master JavaScript??
You Don't Know JS, link in the pinned mesasge
http://eloquentjavascript.net/
eloquentjavascript.net and javascript.info for a more modern but less practical one, still great
usually, the problem is not understanding the language per se.. If you know any other language a little, you might be fit enough for javascript. There are a few new concepts though (async await, Promises) . Depending on how much you already know about programming languages, it might help to know what you actually want to do. The most tricky part is understanding how the different data structures work.. Promises, Callbacks,
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