How to buy Starknet ETH?

How do I go about purchasing Starknet ETH? Could you please guide me through the process step by step? I'm new to this and want to ensure I do it correctly. Is there a specific platform or exchange I should use? Are there any fees involved? Also, what are the risks I should be aware of before making this purchase? Any advice on how to stay safe and secure during the transaction would be greatly appreciated. Thank you in advance for your assistance.