Where can I buy Aeternity?

I'm interested in purchasing Aeternity, but I'm not sure where to start. Could you please guide me on the best platforms or exchanges where I can safely and securely buy Aeternity tokens? Are there any specific requirements or steps I need to follow to ensure a smooth transaction? Additionally, are there any fees associated with buying Aeternity, and if so, how do they compare to other cryptocurrencies? I appreciate your help in navigating this process.