When user fill the registration form he should get the email like thank you

Hi, are you referring to free or paid membership signup? If it is the free membership signup then the member will not receive a thank you e-mail unless you are using the Form Builder add-on.

If you don’t want to purchase the Form Builder add-on then you can redirect the new member to a thank you page using the following function.

You can add the following function to your theme functions.php file.

add_action('swpm_front_end_registration_complete', 'sam_after_registration_redirection');
function sam_after_registration_redirection()
{
$url = 'http://www.yourwebsite.com/thank-you/';//TODO - Specify the URL that you want to redirect to
wp_redirect($url);
} 

Yes, the Form Builder add-on has two options.

Confirmation = After someone submits a form, you can control what is displayed. By default, it’s a message but you can send them to another WordPress Page or a custom URL.

Notification = When a user submits their entry, you can send a customizable notification email.

Yes, that is correct.

Hi, unfortunately no. You need the Form Builder add-on to add extra fields to the registration form.

Regards

Hi, please check the following documentation. Let me know if this is what you are referring to.

Thank you