jQuery is a huge subject: it’s the topic of many books, but almost everyone agrees that the best documentation is on the jQuery site, at http://jquery.com/.
Go directly to http://docs.jquery.com/ for documentation (though don’t skip that front page above).
Go directly to http://docs.jquery.com/Tutorials for tutorials, though there are many more online.
Wrap your head around jQuery: http://docs.jquery.com/How_jQuery_Works
Nathan Segal provides some good instruction in his article, “jQuery Mobile in Adobe Dreamweaver CS6” at http://www.htmlgoodies.com/html5/mobile/jquery-mobile-in-adobe-dreamweaver-cs6.html.
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