If you want to know how to hack unknown wifi password,  follow the below steps-

First, you need to determine the type of security protocol used by the network.

Once the security protocol is determined, you can use a variety of tools like Aircrack-ng, Reaver etc. to attempt to crack the password.

You may also be able to use brute force attacks to crack the password.

If the security protocol is particularly strong, you may need to use dictionary attacks.

If the security protocol is really advanced, you may need to use a rainbow table attack.