Why are there so many types of lenses for cameras?

Im a student in college and for my unit I need to learn about lenses and what a professional photographer would look for in a lens when they are buyin

I'm a student in college and for my unit I need to learn about lenses and what a professional photographer would look for in a lens when they are buying them.

or:I'm a student in college and for my unit I need to learn about lenses and what a professional photographer would look for in a lens when they are buying them.

or:Well, there is a lot to learn. You have to learn focal length, aperture, focus (soft or hard), and then there are the tricks such as fish-eye, zoom, close-up, and others. It gets to where you decide to drive a cab instead, and hire a photographer if you ever need one.

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