Where is safe to buy USDT?

Could you please provide some guidance on where it is considered safe to purchase USDT? I'm new to the cryptocurrency market and am looking for reliable and secure platforms to make my first investment. Could you recommend any well-established exchanges or brokers that offer USDT trading services? Additionally, are there any specific factors I should consider when choosing a platform, such as transaction fees, customer support, or security measures? Thank you for your assistance in navigating this new territory.