I just read about "ETH with features like liquid staking" on which platform can you do that and how does it working? is it the same as the usual STAKING know from most other big crypto currencies?
You still maintain liquidity when staking . You will get a derivative token which represents your staked token for example SETH => ETH. But you can use SETH while getting staking rewards for defi , lending protocols & other stuff.
You are incorrect. Your coins are locked for a certain time and are used for validating transactions on the Ethereum blockchain. In return, you receive staking rewards. If you use liquid staking, your tokens are not locked, but you pay a fee to the protocol from your staking rewards. I just listed lending as an example what you can do with your liquid token .