Most beginners take pictures by selecting the creative modes on their cameras but few ever venture into any of the other modes like Aperture Priority, Shutter Priority or Manual mode, perhaps based on fear.
Hopefully the following entry will help simplify things, remove that fear and help you in learning how to shot your camera in manual mode. You will need to know how to set your camera's ISO, shutter speed and aperture settings to do this and in doing so you will get better pictures.
The Exposure Triangle
Every picture you create requires an exposure that consists of three different adjustment settings, the ISO, shutter speed and aperture. These three things make up the Exposure Triangle. Adjusting one will have an impact on the other two.