1.The exposure will be higher and the image in the darker lighting will come out to be brighter.

   2. He said to use the lower ISO settings in areas where there is plenty of light, but if I wanted to use the lower ISO setting in a lower lit area then the exposure time would take longer.

  3.  Author said that I should use the higher ISO settings when ever I am shooting in areas with low light and for when taking pictures of anything moving at a high speed. He also said that using a higher ISO will also set in for having possibly grainy pictures.?