Yes. It is possible to win money, even to win big. But since this is the nature of gambling, it is also possible to lose big. Your winnings are randomly generated so that you have the same chance of a win every time you spin. The games are fair, and they are unpredictable.
They are also controlled by RTP - Return To Player. This is a percentage showing how much you can expect to get in return. If the RTP is 98%, you can expect to get €98 back on average over time for every €100 you bet. Note - this is an average, not a guarantee. It also indicates that you are most likely to spend more than you will get in return.