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One that tries to explain how changing the settings for aperture, ISO and shutter speed changes the picture.
Again, a graphic can only show so much, read into this a bit more and change the settings on your camera to really understand what is going on.
It sadly does not show though how these settings change the picture in terms of exposure.
General advice here: small shutter speed and aperture number -> more light
Small ISO number -> less light compared to high ISO number
In an ideal world exposure wouldn't be a problem, but light is often a problem when you want to use certain settings.
Let us say you want to take a picture of many figures together, this means you need to use a small aperture (small aperture = high number) so they all get equally sharp.
But that means you have less light, so you make the shutter speed slower (slower = small number), which makes it difficult to take a non-shaky picture.
But hey, you could raise the ISO for more light, but higher ISO makes the picture all noisy :(
List goes on and on, you always have to find a good combination of the three and, if possible, provide tons of light for best results.