Did not know anything about cryptocurrency before, just create account to send and receive money from my broker.
So you should learn and differentiate between custodial and non-custodial wallets. Try to use non-custodial wallets and be your own banks.
With non-custodial wallets, you totally control your wallets, from private keys/ mnemonic seeds, transaction fees, change addresses, etc.
See at
Custodial vs. Non Custodial Wallets - "Not your keys, not your coin" Explained.I did not set up 2FA because I assumed that it will be safe site (now i know it was foolish thinking).
In crypto, one of very first things you must do after account registration is activate your 2FA. In the process of activation, remember to backup your 2FA secret code and test its validity for any case in the future that you need to recover your 2FA.
Is blockchain.com in power to check where that money goes or there nothing now to do??
You can check it with bitcoin block explorers but you mostly won't know who are owners of those addresses and bitcoin transactions are irreversible.
List of useful Bitcoin block explorers. Because of privacy, make sure to check it with Tor.