'What is a keychain password?': How to navigate Apple's Keychain Access app and change your password

A keychain password is the master password for your Mac's "Keychain Access" app, which stores your usernames and passwords.

How to change or reset your iPad's passcode, even if you don't remember what the passcode is

To reset or change your iPad's passcode, you can use the "Passcode" menu in your Settings app, or reset the entire device.