Mozilla Developer Network JavaScript Resources

When I am looking for anything to do with js, html or css on the web I tend to put the letters mdn into the search line along with whatever else I am looking for. This usually pushes me to the pages on the Mozilla Developer Network. They are consistently of high quality - unlike for example W3Schools and are clearly written by the type of people who possess the knowledge that I want.
Mostly it is just a dip in to find our a syntax here and there, but they do offer comprehensive book style start to finish information. The JavaScript Guide for example is here.
I have been programming in JavaScript for quite a while now, so I am not reading this line for line, but a scan through it is clearing up some long held confusions for me.
I reckon getting proper skills into your head and hands is a slow process and the way there is to persist and add new pieces every day. Going through the MDN docs is an example of this.

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