ISO
ISO is simply a setting which darkens or lightens your photo. If you increase you ISO number it will brighten your photo and if you decrease it it’ll darken the photo. ISO is good for capturing photos in dark environments or be more flexible about your aperture and shutter speed settings. The lowest native ISO on your camera is your “base ISO”. This is a very important setting, because it gives you the potential to produce the highest image quality, minimising the visibility of noise as much as possible.

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SHUTTER SPEED
Shutter speed is the speed of which the shutter of the camera closes. Fast shutter speed creates shorter exposure however a slow shutter speed gives the photographer longer exposure. shutter speed or exposure time is the length of time that the film or digital sensor inside the camera is exposed to light when taking a photograph.The amount of light that reaches the film or image sensor is proportional to the exposure time.

APERTURE
Is the hole or opening of a camera which light travels through. Its the focus length of an optical system this determines the cone angle of a bunch of rays that come to focus in an image plane.