Where can I buy Aragon?

I'm interested in investing in Aragon, but I'm not sure where to start. Could you provide some guidance on where I can purchase Aragon tokens? I've heard of a few crypto exchanges but I'm not sure which ones support Aragon. Is there a specific platform you recommend? Additionally, what are the steps I need to take to complete the purchase process? Are there any security measures I should be aware of? I want to ensure I'm making a safe and informed investment decision.