Letsencrypt is a free SSL certificate provider. Some hosting providers have enabled automatic Letsencrypt feature, so when you host with tehse providers, you will automatically get SSL certificate. Some hosting provider provide Letsencrypt support. Therefore, if you want to use Letsencrypt, you can ask them how to use it. My host does not have automatic Letsencrypt feature and also does not provide Letsencrypt support. How do I use it.