I'm pretty sure that I didn't set a password because also I don't want to remember or write anything. I thought letting the software and powering off will freeze the wallet. My friend has told me not to save the seed on any place expect the laptop to secure the crypto and I was pretty sure nothing will hurm the laptop or the ssd.
Most wallet require you to setup password/PIN when you open the software for first time. Have you considered possibility you're using password that you usually use elsewhere?
What is wallet.dat? I couldn't find through Google
I searched on bitcoin core folder and couldn't find that file.
Have you tried searching "wallet.dat" on your whole computer (including hidden/system file)?
That's unfortunate, yes there are some ways to brute force your wallet, only if you knew and remember partial/some details of the password, but on your case seems you totally forget about it, try to remember it, coz bitcoin core will not require and ask a password if you did not set a password on it AFAIK (correct me if I'm wrong though).
But i think that any wallet password that has been misplaced can never be recover again, because i have seen someone that misplaced his phrase code and up till date the bitcoin in his wallet he never have access to penetrate into the wallet, so if this particular solution you render can be of help to retrieve a missing password that means all lost password can be recovered?
If you have unlimited time/resource, you could recover any lost password. But realistically it's only possible if total possible combination relative small or you remember most parts of your password.