Heres a great Canon vs Nikon shooting modes cheat sheet to help understand Camera settings
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this site shows how to do a five light set up. it also explains why this can be very important for professional photos like sports or model photos. it also provides examples and proves that it gives more light is is necessary.
These different types of lighting create different gradients and colours of light giving an image more meaning and depth. The way the light is enables the image to be more interesting and direct to what you want for your shoot.