ssh

Secure Shell (SSH) is a Command Line Interfaceand secure protocol for connecting to remote terminals.

Bastion Hosts

Bastion hosts is an entrypoint or proxy that is connected to first, before jumping through that to connect to the final destination.

### The Bastion Host
Host bastion-host-nickname
  HostName bastion-hostname

### The Remote Host
Host remote-host-nickname
  HostName remote-hostname
  ProxyJump bastion-host-nickname

See also: An Excruciatingly Detailed Guide To SSH (But Only The Things I Actually Find Useful)

To exit out of any SSH session: return + ~ + . (return, tilde, dot)