Forex traders use leverage to increase the dimensions of the sums that they can control ( lots ). This means that your $10 controls $1,000 or $2,000 in the market, or your $100 controls $10,000 or $20,000 in the market. This is how folk make cash fast with foreign exchange. From this example you will see that forex is risky. In this it is like all hopeful investment. Talking generally, the danger increases along with the potential returns. There are safe investments like government bonds where you have a warranted return, but it’s's low. Then there are risky investments like stock or foreign exchange trading where you can make money fast and make a lot, but on the other hand you can lose it all. So it’s critical not to trade with money that you cannot afford to lose.
Luckily currency exchange brokers provide demo accounts where you can try out your skills and trading systems on a virtual money account till you are profiting on a consistent basis. But once somebody has learned to trade gradually and well, it is certainly possible to earn money fast with forex.