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