OpenSSH: "SSH Protocols"
Read this article. As you read, pay attention to how SSH protocol is defined and the difference between FTP and SSH-based Secure FTP.
Click https://en.wikibooks.org/wiki/OpenSSH/SSH_Protocols link to open resource.
Read this article. As you read, pay attention to how SSH protocol is defined and the difference between FTP and SSH-based Secure FTP.