Porjectorria V3.2.2

could u tell which is the password

It is the one your defined in the global parameters screen

Don't forget to save the user to have the password updated.

You are messing with password.

In $parameters.php file, you have the password to the database.
This is the password you indicated in the configuration screen.
This is also a password you can use to connect to the database with phpMyAdmin.

Now, in the Global Parameters screen, you have a parameter called "default password" in the section "user and password".
It is the password that will be set when you reinitialize the password of a user.

No i'm talking about the password when i reset the password of any user

YES, you are

I get this message
"Password reset to ''.
Please save to take this change into account"

This message is displayed when you reset a password using button "initialiser le mot de passe".
And it's clear default password is not defined.
Go to the Global Parameters screen : solution to your problem is here.