Will Let's Encrypts own sites use Let's Encrypt certs?

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  1. You do not need another certificate for the www subdomain. You can just use SANs for this.
  2. On LEs own website this is how it is used. One certificate for www.letsencrypt.org and letsencrypt.org is used. This makes it possible that https://www.letsencrypt.org redirects to https://letsencrypt.org.
  3. It is very common (and recommend) to use a cert with at least the www subdomain included as your default one, because there may always be users who type in https://www.<domain>.<TLD> and always users who only type in https://<domain>.<TLD>. (Note that https:// sometimes does not have to be typed in) If you would not do so such users may get scary SSL errors and they do not know what they did wrong.
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