I have a question; does putting the solana to a pool of staking have any risk? Does it depend on the pool?

You risk losing tokens when staking through a process known as slashing. Slashing involves the removal and destruction of a portion of a validator's delegated stake in response to intentional malicious behavior, such as creating invalid transactions or censoring certain types of transactions or network participants Full detail ???????? ???? https://docs.solana.com/staking