How to shoot fireworks?

What settings would I need as far as shutter speed, aperture, etc? Also, please explain those terms? I'm going to shoot a few photos on "auto" but I'd like to experiment a little ( but I don't know how!). I'll have a my "bridge" p&s or possibly my universities Nikon D3100 ( a bit intimidating! ) Unfortunately I won't have a tripod

You need a tripod to get dramatic photos.

Here is a video about shooting fireworks.

http://www.adorama.com/...-AdoramaTV

If you don't have a tripod, don't bother trying for any trails with long exposures. Maybe you can get away with 1/4 second if you brace the camera on a car or a firm backpack or something. Try 1/4 sec, wide open (probably f/3.5, unless you need to zoom in). Start at ISO 200 and increase it if you shots are too dark.

How To Photography: 8 Helpful Tips to Photograph a Fourth of July Fireworks Spectacle:
http://www.photographytalk.com/photography-articles/how-to-photography/2476-how-to-photography-8-helpful-tips-to-photograph-a-fourth-of-july-fireworks-spectacle

Here is what I use

* tripod
* set the ISO to 200
* with the lens in manual mode and focus on infinity
* set the shutter speed to bulb
* open the shutter for two or three bursts.
* adjust the lens aperture to adjust for the best colour saturation.

Samples of the results.

Wide angle lens
tripod
long shutter speed (preferably bulb)
black card
know what you are doing with the camera…