ISO , what is it and how to use it ?

ISO, basically means how much of light do you want to hit in your sensor . The more light you allow , the more brighter the picture is going to be . Allow too much and you'll get a white photo . The less light you allow , the more deemer the picture is going to be .
It varies closely in relation to the Aperture and Shutter speed of the camera .
More abt ISO , Aperture and Shutter speed are demonstrated in the videos below .
Feel free to ask any questions about these settings .
Cheers .