– For your first requirement, you can use our Advanced Custom Fields, by using this you can add custom fields in the registration form. When a users submits a register form you can check all details from Users > All Users > view users details section.
– You can find the stats here Downloads > Stats section and also download/export the data as a CSV file.
– For user data extraction, you can easily export them from users section or any third party plugin like Import and Export user data
