The best way to gain money from money is to make an investment or maybe buy and sell process it is really profitable if you will be serious on making an action on this feild the best thing to do here is to become always active on checking the price on the market place.
If you want to invest, then you need money. And for serious investments you need serious money. Now I'm investing in Bitcoin, but I'm always in short of money.
Ofcoirse investing meeds money you can't invest without it. Well i don't get clearly what you are pointing out. Investment needs you to risk and it might lose your money or you are going to win that is investment the point is if you wnat to invest make sure you can afford it to lose or either you have a backup funds if anything happens.