How to buy Aptos with ETH?

Could you please explain the process of purchasing Aptos using Ethereum (ETH)? I'm interested in understanding the steps involved in this transaction. Could you guide me through the necessary platforms or exchanges that support this trade? Also, what are the essential factors I should consider before making such a purchase? Is there a specific time of day or week that's more favorable for buying Aptos with ETH? Additionally, how do I ensure the safety and security of my transaction? Could you provide any tips or advice on avoiding potential risks? Thank you for your assistance in clarifying this process.