tangon@tangodeMacBook-Pro workspace % ssh -T -p 443 git@ssh.github.com
 
The authenticity of host '[ssh.github.com]:443 ([20.205.243.160]:443)' can't be established.
 
ED25519 key fingerprint is SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU.
 
This key is not known by any other names
 
Are you sure you want to continue connecting (yes/no/[fingerprint])? 
 
Host key verification failed.
tangon@tangodeMacBook-Pro workspace % ssh -T -p 443 git@ssh.github.com
 
The authenticity of host '[ssh.github.com]:443 ([20.205.243.160]:443)' can't be established.
 
ED25519 key fingerprint is SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU.
 
This key is not known by any other names
 
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
 
Warning: Permanently added '[ssh.github.com]:443' (ED25519) to the list of known hosts.
 
Hi hao1032! You've successfully authenticated, but GitHub does not provide shell access.
 
tangon@tangodeMacBook-Pro workspace % vim ~/.ssh/config

https://stackoverflow.com/questions/38556096/github-permission-denied-publickey-fatal-could-not-read-from-remote-reposit