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What is the relationship between Red Hat and Linux? Does Red Hat own linux? Does Red Hat work with any systems besides Linux?
Linux is an operating system kernel. By itself, it's not very useful. However, an operating system can be built around it.
Linux is free and open-source. This means that nobody owns it, and its source code is freely available to everybody.
There are many operating systems that use Linux. These OSs are called distributions of Linux. For example, Debian GNU/Linux, RedHat Enterprise Linux, Ubuntu, CentOS, etc.
Red Hat is a company that has released several Linux distributions, including Red Hat Linux and RedHat Enterprise Linux. They also sponsor Fedora.