How to buy 1 USDT?

How exactly can I purchase 1 USDT? Could you please provide a step-by-step guide? I'm new to the cryptocurrency world and am looking for a clear and concise explanation. What platform or exchange should I use? Do I need to set up a wallet first? Also, what are the associated fees for purchasing USDT? Is there a minimum amount required for the purchase? Any advice or cautionary notes would be greatly appreciated. I want to make sure I do this correctly and safely.