Where can I swap ETH?

Could you please elaborate on the various options available for swapping Ethereum (ETH)? I'm particularly interested in understanding the different platforms and exchanges that facilitate such transactions. Are there any specific requirements or steps I need to follow? Additionally, are there any fees associated with swapping ETH, and if so, how do they vary across different platforms? It would be great if you could provide a brief comparison of the most popular options, highlighting their key features and any potential risks involved. Thank you for your assistance in navigating this process.