Certbot

Generate a certificate for nginx

$ sudo certbot --nginx

$ sudo certbot --nginx -d example.com

List all the certificates

$ sudo certbot certificates

NOTE: check each nginx conf files updated by Certbot

Delete a specific certificate

$ sudo certbot delete --cert-name example.com

EXPAND, add a new domain to existing certificate

$ sudo certbot certonly --expand --cert-name existingdomain -d existingdomain.com,www.existingdomain.com,new.existingdomain.com