Can I buy ETH on MetaMask?

Could you please elaborate on the process of purchasing ETH through MetaMask? I'm curious to know if it's a straightforward procedure and whether there are any specific steps I need to follow. Also, I'm wondering if there are any limitations or restrictions that I should be aware of before making a purchase. Additionally, how secure is the process, and what measures does MetaMask take to ensure the safety of my transactions? Lastly, are there any fees associated with buying ETH through MetaMask, and if so, how much can I expect to pay? Thank you for your assistance.