There are several ways to attend a college for free.
Scholarships: If you have a talent, excel in science, excel in academics, excel in athletics, belong to a minority group or have a disability then you may qualify for a scholarship. Your local charities and non-profits may have some scholarships for you too.
Financial Aid: : You may qualify for the financial aid from the federal govt. if your parents’ income is below a certain level or if you can prove that you are not dependent on your parents.
Investing: : If you don't qualify for either of them, you can always invest in the stock market and real estate.