How to buy USDT in China?

I am a beginner in the cryptocurrency world and am interested in purchasing USDT in China. Could you please guide me through the process? What are the legal and reliable platforms or exchanges I should use? Are there any specific rules or regulations I need to follow while purchasing USDT in China? How secure are these platforms, and what measures should I take to protect my funds? Additionally, what are the potential risks involved, and how can I mitigate them? Thank you for your help!