Just bought its PDF version to show some support, it's a decent site for JS indeed. I use another site more often though at <a href="https://www.javascripttutorial.net" rel="nofollow">https://www.javascripttutorial.net</a>, which is not as deep as this one, but way more concise. It's kind of like w3schools, not the best authoritative site, but, nothing beats its simplicity.I support all of them.