Want to change password. forgot old password
Need to change password. forgot current password
iPhone 7, iOS 13
Question marked as
If you mean your Apple ID password—>If you forgot your Apple ID password – Apple Support
If you mean your phone’s passcode—>If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support
If you mean your Screen Time passcode—>If you forgot your Screen Time passcode - Apple Support