How do filmmakers make money in the film industry?

Here is a question someone asked about making money:
One day I hope to study film and become a screenwriter/director. I don’t know much about the film industry quite yet, so that’s why I plan on getting into a good film program in college. I have only one concern: how do filmmakers such as producers, screenwriters, and directors make money from their films? How do independent filmmakers make money?

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