You are asking tech. stuff and even though many answers are true. here you will find all you need:
www.dpreview.com is a GREAT well known site for info. on cameras and how to questions.
I am a Canon 20D user and dSLR is the way to go if you want to get into photography at a deeper level-where you will have control of exposures throughout the whole spectrum..
I know the Canon power shot series are very good and can do a lot.
Try using teh M mode (I think they have one)..
(Manual for greater control..a tripod is most definite for anything under 1/15. Someone posted 1/60 that's quick enough for a steady shot.....but then again..it depends on experience and skill.
The best thing to do is to experiment with all the different settings and you will soon find out what
works... Here's a shot I took last night in the heavy fog I was in..I wanted a better stting but time didn't allow for me to scope out a good place for a shot...
heres the file info:
Exposure time: 4/1
Shutter speed: 4.00
F-stop: 4.0
ISO speed: 200
Focal length: 32.0000