How to buy an Aurora chain?

Can you walk me through the steps of purchasing Aurora chain? I'm new to this and want to make sure I'm doing it right. What exchange platforms support Aurora chain? Do I need to set up a digital wallet first? Are there any specific security measures I should take when buying Aurora chain? Additionally, is there a minimum amount I need to buy, or can I purchase any amount I want? Finally, is there a way to track the price of Aurora chain so I can make informed decisions about when to buy and sell?