Some have commented that the linked article may not always contain best practices. The following links always seem to get fantastic praise - they're permanently in my JS bookmarks. Having an understanding of the core language rather than using frameworks is a great start; these articles will certainly help.
Eloquent JavaScript: http://eloquentjavascript.net/contents.html
Learning JavaScript Design Patterns: http://addyosmani.com/resources/essentialjsdesignpatterns/bo...
JS The Right Way: http://jstherightway.com/
Learning Advanced JavaScript: http://ejohn.org/apps/learn/
Ask HN: JavaScript Dev Tools: http://news.ycombinator.com/item?id=3550998
MVC Architecture for JS: http://michaux.ca/articles/mvc-architecture-for-javascript-a...
Large-Scale JS Application Architecture: http://addyosmani.com/largescalejavascript/
Mozilla Developer Network - Intro to OO JS: https://developer.mozilla.org/en-US/docs/JavaScript/Introduc...