The financial market works in a simple way, aligning the interests of those who want to earn their money and others who need the money. To be an investor it is important to choose a reliable brokerage. In a reduced way, there are two types of investments, those that bring a fixed income , and those that bring a variable income. Every investment has the objective of making a profit. However, some are more aggressive than others. The most aggressive, seek more expressive returns. Fixed income is considered more conservative and its yield is more predictable, normally linked to some index such as the CDI. Meanwhile, variable income has short-term fluctuations, but in the medium and long term it often outperforms fixed income.