This chapter provided just a few examples, but they already serve well to demonstrate central key facts of jQuery. In particular, you should memorize the function $() and the method ready(). But techniques for specifying reactions, such as the method click(), are also of elementary importance. And animation techniques such as addClass(), toggleClass(), removeClass(), and slideToggle() are also going to be helpful in practice later for DHTML effects. In this chapter, you also learned about changing attribute values (attr()). You will more fully understand these techniques as you work through other chapters of this book and have delved deeper into the overall concept of jQuery.