chkconfig command

I am a new CentOS Linux server user. How can I start, stop, or restart the OpenSSH (SSHD) server on a CentOS Linux? How can I start/stop/restart SSHD on boot time on a CentOS Linux 7.x or 8.x? Can you tell me how to start SSHD on boot time on a CentOS Linux?
[continue reading…]