To become a  Professional Photographer we must have  deep  knowledge of  camera functions or its buttons etc. In dslr  the main and  you can say (big 3) functions are  Aperture , Shutter and ISO. Each  of  them has its own function   and  to click a better picture we  must  have a deep understanding of them (  Aperture , Shutter and ISO)

Aperture

A camera lens functions just like the human eye. 
The pupil is responsible for how much light is let in. 
To allow more light to pass through 
the pupil opens up or expands a
nd to allow less light 
the pupil closes or shrinks .
Aperture works the same way. 
Aperture is the opening through which light travels 
and eventually hits the camera's sensor. 
It is the size of the aperture's opening 
that not only affects the brightness of the image 
but it directly affects the area of a shot 
that is in focus. 
This is known as Depth of Field. 
The smaller the aperture, the greater the depth of field 
Conversely, a large aperture 
gives us a shallow area of focus. 
The size of a camera's aperture is expressed in f number 
or f stops. 
Based on how open 
or closed the aperture may be.

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