What happens to staked ETH on Coinbase?

Could you elaborate on the implications and processes surrounding staking ETH on Coinbase? Specifically, I'm interested in understanding the mechanics of how staking works, the potential rewards associated with it, any lock-up periods or restrictions, and what happens if the value of ETH fluctuates significantly during the staking period? Also, does Coinbase have any measures to safeguard users' staked ETH from potential risks, such as hacks or technical issues? Finally, is there a minimum or maximum amount of ETH required to begin staking, and what are the withdrawal procedures if I decide to end my staking period early?