How does a Linux computer look like?

Answer 1

Linux doesn't look like anything. It is a kernel upon which complete operating systems can be built. Each Linux operating system, known as a "distro", has its own unique appearance.

Some of them are pretty spectacular and make mainstream OSes look like muck. Some look like gibberish spewed out of a teletype machine. Linux has this way of being just what you want, or, sometimes, almost-but-not-quite what you want. If you're not paying attention, it can even manifest itself as what you deserve. Linux is mutable.

Answer 2

As far as hardware goes, a computer running Linux will look like any other PC.

For software, it will look a lot different compared to Windows and Mac systems (however because Mac OS and Linux are derived from UNIX, their file path formats will be identical: "/home/user" as opposed to "C:\Users\User")