2

Here is the workflow

  1. Users register with a valid email and a password
  2. Drupal automatically sends an email to the new registered user
  3. The email contains a link to verify the email
  4. The email verification is performed

This is similar to email addition and verification of http://drupal.org. I can't find any module for that purpose. Some patches are available on https://www.drupal.org/node/115801. Any way?

1

That sounds like the core behaviour to: "Require email verification when a visitor creates an account"

Drupal 8 account settings

However, the password will be selected after clicking the email verification link, to activate the account.

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