http://certbot.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/fa/faq
On supported systems, the automated configuration makes it fast and easy to obtain, install, and automatically renew certificates. If automated configuration is not supported for your web server, you can still get a certificate using Certbot and configure your server software manually. In this case, the certificate will not be renewed automatically.