Yes you invest real life money into bitcoin online money and than after a while the prices goes up and you cash it back out you have more than you had invested in it that is how investments go it is very easy to understand this whole situation.
Making money from is very simple with bitcoin. You can also make it with other currencies but due its high value in market and high rising rate in the value of the bitcoin its easy .with bitcoin to make money from money. Today you invest some bitcoin will generate a high income in future for you. Trading in bitcoin is also a very simple way to make money from money.