I am nearly done reading every article of the series of JavaScript.info: https://javascript.info/

I am working with JavaScript as one of my main programming languages for Browser applications or on the server side with Node.JS for years. I think this series of articles gives the best overview of what JavaScript has to offer and how to handle the programming language and understand it well.

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It is clear, comprehensive and compact. If you are into JavaScript or about to learn it, have it a try!