What should I do for my father?

Get a simple job and a cheap pad within walking distance. That is so you don't have to waste your money on transportation. Save half of everything you earn. Yes, half. To start, keep your savings in gold or silver coins which you do not store in anybody else's vault. (IOW hide them at home.) Spend your evenings studying investment books at the public library. When you are smart enough then you can make other investments. If you earn ten bux an hour and save half, in only ten years you will have A HUNDRED THOUSAND BUX not counting interest or capital gains or paper profits: only principle. There is no other plan that will give you a net worth above zero in only ten years. And there is no school that will teach you any such thing.

When your father is too old to work, you can take care of him.

Does this plan work? Andrew Carnegie worked five years, saved his wages, and then put it all into a tech stock: telegraph. You might have heard the name. His hobby was building concert halls and libraries.