Business?College? Can someone enlighten me please….?

I am going to be a junior in high school, but no one really tells you about WHAT college really is. I want to have a career in a large business, cooperation, etc. One of those office jobs that you can move up in and work towards something. What type of degree would help me achieve this? What classes do I even take in college? Are classes based off your wanted degree? Anyone that answers, thank you soo much. Sorry if my questions seem silly.

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