in eth smart conterct
how can get private key of my smart contract on after and before of deploy ?

there is no private key for a smart contract

but on tron smart contract have private key

is it true ?

idk, I haven't deployed anything on this centralized database

Nope it's almost same as eth, no private keys for contracts

So on some smart contract
the creator of smart contract how can give all balance of smart contract ?

How is this possible ??!!

owner.transfer(address(this).balance)😅