Photography is an art and to a photographer it is more than a religion with the love that is put into photography by the man is quite adorable....
There are three pillers of photography...
1)ISO – the measure of a digital camera sensor’s sensitivity to light
2)Aperture – the size of the opening in the lens when a picture is taken
3)Shutter Speed – the amount of time that the shutter is open
Mastering the art of exposure is something that takes a lot of practice. In many ways it’s a juggling act and even the most experienced photographers experiment and tweak their settings as they go. Keep in mind that changing each element not only impacts the exposure of the image but each one also has an impact upon other aspects of it (ie changing aperture changes depth of field, changing ISO changes the graininess of a shot and changing shutter speed impacts how motion is captured).
Creating a harmonious exposure using the aperture, shutter speed and ISO is a juggling act. As soon as you make a decision about one element, you'll need to compromise with another.
the below Pic is captured by me....!!
Credits: Digital photography school