Check out https://studentaid.ed.gov/sa/types - money isn't "earned" through a FAFSA application, it gives the schools that you've identified on the FAFSA application access to your financial situation, allowing them to make choices in determining eligibility for financial aid, including student loans. BEWARE student loans, as they aren't really "aid", they are a LOAN that must be paid back. School is expensive, and financial aid departments sell loans so that you can attend their school. A FAFSA application is also necessary to apply for many grants and scholarships, including state or federal funds.
You've received some great information from the CV Professionals without my repeating. I highly recommend you review the FAFSA website and become familiar with the process. Here are a few links to help you get off the ground with your research. Good luck to you!
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