What is the minimum TRX buy?

Could you please clarify the minimum amount of TRX one can purchase? I'm interested in investing in Tron, but I'm not sure if there's a specific threshold or minimum requirement when it comes to buying this cryptocurrency. Is there a standard minimum purchase amount set by exchanges or does it vary depending on the platform? Additionally, are there any fees or charges associated with buying small amounts of TRX? I'd like to understand these details before making a purchase. Thank you for your assistance in this matter.