Apart from all the wonderful resources listed here, one thing that really thought me a lot was writing stuff without using a library like jQuery. Try writing br

Apart from all the wonderful resources listed here, one thing that really thought me a lot was writing stuff without using a library like jQuery. Try writing browser-compatible event handlers (you'll find quirksmode.org an immensely helpful resource), an AJAX request, a simple pubsub/observer pattern, etcetera. This will learn you a lot about the language, and it'll be a lot of fun too!