On this page I've organized my posts on exposure. I've started with the simplest, foundational elements of exposure and then built upon those elements to address the big picture of how to properly expose your images. Don't feel like you have to go through these in order. You can start where you think the holes in your knowledge are. I've made extensive use of hyperlinks here to other posts related that will explain terms and concepts. Feel free to click around and follow the trail of your curiosity.
Part I, Exposure Definitions
Exposure--This post defines exposure and summarizes the three exposure factors (aperture, shutter speed and ISO).
Stop--This post explains the concept of a "stop," or the way changes in the amount of light recorded by your camera's sensor is measured. If you're new to photography, this is a foundational concept that will help you make sense of the three exposure factors.
Shutter Speed--This post explains how changes in shutter speed can affect your photography.
Aperture--This post defines aperture and f/stop as well as the benefits of manually setting the aperture.
ISO--This post explains how you can use the ISO setting on your camera to take sharper pictures in low light situations.
Depth of Field--This post explains how you can control how much of your photograph is in focus.
Part II, Exposure Basics
Balancing Exposure--This post explains how to balance your shutter speed, aperture and ISO to gain the effects you want while maintaining proper exposure.
The Art of Compromise--this post explains how to work with your three exposure factors to help you compromise what you want less to get what you want most.
Using Your Histogram--This post explains how to use your histogram to ensure that you're getting proper exposure in your images.
Field Practices to Improve Exposure--This post explains how you can be aware of your surroundings and shoot to make the best of your environment.
Exposure Compensation--This post explains how to adjust the automatic exposure reading of your camera's light meter to get the camera to give you the results you want.
Natural Light--making the most of the way your scene is naturally lit.
RAW or JPEG--Which should you use? This post will help you find the answer.
Part III, Shooting Modes and Metering
Aperture Priority Mode--This is my default shooting mode. You pick the f/stop, the camera chooses an shutter speed. If you need to change it, use exposure compensation.
Shutter Priority Mode--Use this mode when you want to set your shutter speed and let the camera set the aperture.
Spot Metering--This post explains when and how to use your spot meter to ensure you get the exposure you want in tough situations.
Manual Mode--This post explains when using the Manual mode on your camera is the easiest and most reliable way of getting proper exposure.
read these posts here: http://www.learnoutdoorphotography.com/p/exposure-guide.html