How to get an SSL Certificate key?

Question

GitHub

How to get SSL certificate key automatically generated by github pages?
My site can work fine on http protocol, but not on https. In order to connect to https, I need the certificate's SSL key, which has already been generated and released in github pages.

Answer 1

No one will give you a key, you can buy an ssl certificate yourself or generate it using let's encrypt

Answer 2

But who will give it to you? LE is our everything, for such cases it just goes.