If you want to find out how to hack wifi password step by step?, then any stored wifi password in Windows can be decoded by Cain and Abel. The steps are as follows-

Firstly, download the Cain and Abel tool and open it.
Then, select the decoders bar and choose the wifi passwords from the navigation menu. There click on the button with a (+) sign.
And assuming that you are connected to a wifi password, all the passwords will be shown now. So just get the passwords along with SSID and encryption type.