Although I've used JS in sites, it's usually been off the shelf stuff
for a particular thing.
At the moment I'm freelance, but sometimes look for jobs, and JS always seems to be a basic requirement. So I always feel a bit stuck, as even with a few years experience and a reasonable looking portfolio, I don't even seem to possess the basic requirements for a web design job.
I guess the answer is to try to learn a bit, but I wondered if anyone could give any pointers as to some typical practical applications that might help the penny to drop with the sorts if things I could be doing with JS. Because I think that's half the trouble - not really knowing what I'd do with it if I did learn a bit.
Sorry if that's all a bit vague, but I know that this is a great forum for advice.
Here's a great place to start for jQuery: http://www.w3schools.com/jquery/default.asp
Since you are asking for practical applications, here's one: