A responsive image gallery script, take a good look inside the code of this paid script and you will learn a lot about jQuery.
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.
1. jQuery 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.
3. Learning jQuery
Multi-author weblog providing jQuery tutorials, demos, and announcements. There is tutorials for all skill levels.
4. jQuery for Designers
One of my favorite jQuery related resources for visual effects.
5. Learn jQuery Now
Lots of great tips and tutorials for the jQuery learner.
6. jQuery for absolute beginners video series
If you are starting from scratch, these videos will explain you in details how to do some things with jQuery.
7. jQuery How-To
A tutorial blog for jQuery, good to follow for great advice.
8. Visual jQuery
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.
9. jQuery in Action
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.
10. jQuery: Visual QuickStart Guide
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.