How do I buy and use USDT?

Excuse me, could you please elaborate on the process of purchasing and utilizing USDT? As a cryptocurrency enthusiast, I'm particularly interested in understanding the steps involved in acquiring this stablecoin and how it can be effectively utilized in various transactions. Could you guide me through the necessary steps, including selecting a reputable exchange, depositing funds, and finally, how to manage and spend my USDT? Additionally, any insights into the advantages of using USDT over other cryptocurrencies would be greatly appreciated.