If you ever need to securely connect to a remote machine and reach a command-line interface, SSH is the tool for the job. The Secure Shell Protocol (SSH) has been used for decades as a means to remotely interface with Unix / Linux / BSD machines over insecure connections.
SSH operates on a traditional client - server principle where a remote user (client) can connect to a server and run commands as if they were sitting at the machine. SSH is particularly useful if you have a server (perhaps on one of the best cheap web hosts) or Raspberry Pi you need to control remotely. As these systems primarily use Linux, it’s easy to do things like edit scripts, change key configuration files or even install software remotely.
