jQuery Fundamentals is designed to get you comfortable working through common problems you'll be called upon to solve using jQuery. To get the most out of this site, you'll want to read the content and try the various interactive examples. Each chapter will cover a concept and give you a chance to try example code related to the concept.
Most pages on this site include a built-in editor where you can try out code. This code will run against the markup that's displayed in the box to the right of the editor. To run the code in the editor, click the button. Reset the results area to its original state by clicking the icon.
Each chapter of jQuery Fundamentals includes example code that demonstrates the concepts being discussed. Click on the icon in the bar above the example to copy the example to the editor at the top of the page.