One of the best places I've ever seen to learn advanced JavaScript is on ejohn.org. There are several reasons for it, but what I want to mention here is the first slide (after the summary). Our goal! Determining a goal for your audience is the best way to draw attention to the end of any presentation. In this case the effect is even bigger because the audience will have found out till the end of the introduction whether the information is relevant to them, thus whether they are interested to listen / read.

I am amazed how many lecturers failed to do that simple trick and therefore lose connection with the audience.