How do I buy Aptos with ETH?

How do I purchase Aptos using Ethereum (ETH)? Could you please guide me through the process step by step? I'm new to the cryptocurrency world and am not entirely familiar with the exchanges or wallets involved. Is there a specific exchange that supports this transaction? Also, are there any fees associated with the purchase? And how long does the process typically take? Lastly, is there any advice you could give me to ensure a smooth and secure transaction? Thank you for your assistance.