What is the return on stETH?

Could you please elaborate on the return on stETH? I'm curious to understand how it's calculated and what factors influence its value. Is it dependent on the price fluctuations of the underlying asset, Ethereum? Also, does staking have any impact on the returns? How does the staking process work, and what are the risks associated with it? Finally, is there a way to predict or estimate the potential returns on stETH, or is it more of a volatile investment? Thank you for your insights.