So we left off with a promised explanation of the three main components of photography, do you remember them?
-ISO, which represents the sensitivity to light of the cameras sensor.
-Aperture, which controls the cameras diaphragm, therefore controlling the amount of light let into the camera.
-And of course shutter speed, which is measured in fractions of seconds, and controls the speed of the curtain.
Combining these three elements is how photos are created. I know this is a lot to take in, especially if this is the first time you are hearing these terms. And I’ll bet you’re thinking, can’t I just point and shoot if I put it in that little green auto mode?  Well, yes, you sure could, but if you were on the Autobahn, what fun would cruise control be??  Now I myself am a visual and hands on learner, so I think you’d benefit from checking out this diagram, and the nice explanations of the functions of the three fundamentals in this link :  http://www.exposureguide.com/exposure.htm
As you go through the article, take out your camera and get a feel for playing with the settings.
Next time we can see some examples of them in action.

Take a look at the photo below, see how the light varies in the different parts of the building.  Play with the camera settings until you get the overall effect you think looks good.