How to turn Polygon into ETH?

Could you please elaborate on the process of converting Polygon (MATIC) into Ethereum (ETH)? As a cryptocurrency investor, I'm interested in understanding the steps required to swap one for the other, including any fees involved, the most efficient platforms to use, and whether there are any potential risks or considerations I should be aware of. Additionally, I'm curious about the general timeline for the conversion process and whether the value of my Polygon tokens may fluctuate during the swap. Thank you for your guidance.