How to create ssl for domain and how can i use for subdomains

Please guide me how to generate SSL for the domain and how can I use that certificate for subdomains.

Ex:
My domain name is “site.net”, for this I want SSL.
My subdomains are “dev.site.net” and "qa.site.net’ how can I use the certificate for this subdomains.

My all subdomains running under docker using nginx-proxy.
My nginx-proxy was “jwilder/nginx-proxy”

If you want to use a single cert for site.net, dev.site.net, and qa.site.net, then request a single cert with those three names on it. Start here:
https://letsencrypt.org/getting-started/

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