Ask HN: Where do I start if I want to learn AJAX? 18 years ago
You should learn the basics before letting some higher-level framework do all the magic for you.
There are some good articles about AJAX on the Mozilla Developer Center: http://developer.mozilla.org/en/docs/AJAX
You can begin with http://developer.mozilla.org/en/docs/AJAX:Getting_Started
You can also find some good pointers to AJAX toolkits and examples there.