Different Ways to Make Money on the Market

So what are some ways to make money on the stock market. Buy stock today at $12 and then hope the price goes up to $20. That way you make money.

What about if I sell Short stock at $20 and buy it back at $12. I also just made money! What the stock went from 20 to 12, how do you make money that way. Read this explanation on selling short.

If I have no extra cash but I think a stock will be going up I can buy on Margin to get the stock and then pay back the loan. So buying on Margin is also another way to make money.