01 OpenSSL version
wiki:https://en.wikipedia.org/wiki/OpenSSL
02 Using TLS1.3 With OpenSSL
https://www.openssl.org/blog/blog/2017/05/04/tlsv1.3/
TLSv1.3 is a major rewrite of the specification,sp there are major changes and some things work very differently.
new ciphersuits, session estabishment, DSA certificates are no longer allowed, NO DLS1.3 now