jQuery’s official website
Sounds like obvious advice, but jQuery has a very good documentation available for both beginners or advanced users, the two sections you should absolutely bookmark are the documentation and the tutorials.
This is a page that lists a comprehensive list of quality tutorials in several languages, I’ve been learning a lot from there.
2. jQuery docs
Not for beginners, but this section will let you browse references and find most of the informations that you could need.
Blogs and websites
Like for other popular frameworks, jQuery gets some websites dedicated to it. The following websites are great resources for anyone wanting to learn jQuery.
Multi-author weblog providing jQuery tutorials, demos, and announcements. There is tutorials for all skill levels.
One of my favorite jQuery related resources for visual effects.
Lots of great tips and tutorials for the jQuery learner.
If you are starting from scratch, these videos will explain you in details how to do some things with jQuery.
A tutorial blog for jQuery, good to follow for great advice.
Not exactly a place to learn jQuery, but I understood a lot about the framework by getting a visual overview of the functions.
Books about jQuery
Some people learn better from books, the best advantage of working with it is that you’ll get a better overview and deeper understanding of the topic.
This book introduces you to the jQuery programming model and guides you through the major features and techniques you’ll need to be productive immediately.
This book will teach readers how to make the most of jQuery using the task-based, step-by-step, visual format.
11. jQuery Cookbook
Learn how to add components from the jQuery library to your websites and web applications, with detailed recipes for tasks ranging from basic integration to complex user interface development.