1)Buy an apple for 1 dollar.
2)Then sell it for 2 dollars and buy 2 apples.
3)Repeat with 4, 8, 16, 32 apples and so on, until you managed to sell 3500 apples for 7000 usd.
4)Buy a bitcoin

This may advice may sound funny and nonsense but it is logical. Explaining how to earn in a very simple way. Because this is how trading works. Very basic but it takes initiative and hard work to earn and to make your 1$ become a hundred dollar. Also you need to ready your emotion if you want your 1$ grow.