ISO

 

1. What are the advantages of shoot at a higher ISO at a sporting event like basketball or a night football game?

You don't have worry about motion blur.
2. What suggestions did the author make about using a low ISO?

Using a low ISO to avoid too much noise, brighten the photo using a longer shutter speed.
3. What suggestions did the author make about using a high ISO?

Use it to avoid motion blur, use it when there's not enough light and to get a clean, quick photo.