The exposure triangle are three factors that effect the way that a photo is taken, often taught to new photographers as a learning aid.
Shutter Speed is how long you let the light in. Aperture is how large of an opening that lets light in. ISO is how sensitive your picture is to light.
Therefor, a change in one of the elements on the triangle will impact the others. Which means, you can never really isolate just one of the elements alone, and you need to keep in mind how it could possibly effect the other elements.
The purpose of photography for me is capturing the moment, being able to look back on certain things, considering that a photo can last a life time. I use photography when I see a fantastic view, like when the sky is a bright orange color with a hint of pink, or when the sun is shining so bright on the mountains that the mountain become a gorgeous baby blue color.
Capturing the moment with a picture is an upside to photography, yet, there are also downsides to capturing every moment with only a single picture. While taking a picture, there has been studies to prove that you are not actually paying enough attention to the image that you are taking a picture of. There for, if you are to be tested about what you just saw in detail, the answer that you would give, would not be as well described as a person who actually examined that image without capturing a picture on their IPhone or Camera.
I feel like there are only a few differences between taking a picture on an IPhone and taking one using an actually professional camera. Now, with newer IPhones, their cameras are so high in megapixels that when you compare them to a professional camera's picture, there is a possibility you can not tell the difference between the two.