Many wordpress website users allow user to register on there site. After new user registration if we want to show them specific instructions or registration success page then you can use the following code. Put following code into functions.php file.
In this article I explained you about how can we redirect the user after WP registration and send user to specific page.
WP registration send user to specific page
Before adding the following code create your “registration-done” page.
return home_url( '/registration-done/' );
add_filter( 'registration_redirect', 'wpapi_registration_redirect' );