Question on piture taking on camera?

Question

An photograghy expert can explain how to use a digital camera.
best and detail answer will be chosen as my best choice.

1)wat is 'iso' and exposure?
2)wat is the setting to use when taking a night shot with a 4.1mp cam and the 'iso' and why?
3)wat is the setting to use when taking a shot for a fast moving car and why?
4)when do you use a low or high exposure.

Answer 1

1)wat is 'iso' and exposure?
Iso is the equivalent on regular cameras to the grade of sensitivity to light. A low Iso like 50 or 80 needs a lot of light, but gets really good detail, and a high Iso like 400 or 800 needs little light, but can get grainy.
Exposure is the amount of light the picture needs to develop

2)wat is the setting to use when taking a night shot with a 4.1mp cam and the 'iso' and why?
Night shots are usually shot with 400 Iso, because the camera needs a higher sensitivity and needs to grab however little light it can....unless you are taking close pictures with a flash (like in a party, when everyone is close to the camera), then you can use a lower Iso like 200 or even 100.

3)wat is the setting to use when taking a shot for a fast moving car and why?
There you need to set a high speed, like 1/250 or 1/500, what that does is limit the amount of time the diafragm will be open, and will prevent the image to move... but that might cause the diafragm to open more to get more light and then the background might be blurred, unless it's a really sunny day...

4)when do you use a low or high exposure.
Low or high exposures are used to "trick" the camera away for the usual exposure it woild do, for example, if it's a sunny day and you have the sun facing the camera, the object you're shooting might come too dark, so you need to overexpose in purpose so the object cpmes up ok... and of you're photographing something in the dark being lit by a beam of light (like a singer on stage), you need to underexpose it so the subject doesn't come up too bright.

Answer 2

You better contact a Photography School and learn more, than loosing your time asking sporadic questions that will take a great deal of your time.
Time is Gold (money).