Hello, I am new to this world, and I would like to know why people keep money in the USDT currency, if it has any advantages or something, since I keep it in the fiat currency of my country which is the EURO. If there are any advantages, could you tell me? I would also like to know from those with experience in this world what I need to study to know how to invest in the medium term 6-12 months. Thank you, and I am also interested in the volatility in this world, as I want to take advantage when it drops 5-10% to benefit from quick rises. Could someone tell me if that is possible to study? I would greatly appreciate your help.