Where can I buy ETH online?

Could you please elaborate on where exactly can I purchase ETH online? I'm interested in exploring this option but am not entirely sure where to start. Are there any specific platforms or exchanges that you would recommend? Additionally, are there any safety measures or considerations that I should be aware of when making such a purchase? It would be helpful if you could provide some insights on the process, such as the steps involved and any potential fees or charges associated with buying ETH online. Thank you in advance for your assistance.