Holding the camera properly is the best way to avoid or minimize the effects of camera shake. A good firm grip with the right hand and support from underneath means that, when you press the shutter release, movement of the camera will be minimized. This will enable you to shoot sharper pictures at slower shutter speeds.
Although the shutter speeds and apertures are interchangeable as far as exposure is concerned, they each have their own unique effect on the picture. Let's take a look at shutter speeds first as their effect is easily understood. We'll look at apertures further down the page.
Your camera's ISO setting determines how sensitive the camera's sensor is to the light that reaches it. A higher ISO setting makes your sensor more sensitive to light, meaning that you can take photos in darker conditions without the need to use a flash or tripod. However, a high ISO also creates more noise, reducing the image quality.