I read the Asp.net Core uses the Kestrel web server and if the site is facing the internet you need to use a reverse proxy, usually Apache2 or Nginx. I am familiar with Apache so I will probably use that.
I was simply wondering if it is possible to make an Asp.net Core site on a Linux box HTTPS with the cerbot or is it possible with additional configuration?
You don’t have to go into details I just want to know if it’s possible.
You would use Apache's mod_proxy to reverse proxy to your ASP .NET Core site, and then you would use Certbot:
certbot --apache -d example.com
It doesn't really matter whether you're proxying to Kestrel or something else, only thing that matters to Certbot is that you're using Apache at the front.