Technically, Linux is not an operating system, but only a part of one. Linux is the kernel, which is the core part of the operating system that manages everything that goes on, while the operating system, more often than not, is GNU (the G is not silent.) Hence, why some people prefer to call it GNU/Linux. However, there are some Linux distributions which don't rely on GNU stuff, such as Alpine Linux. Don't feel pressured to change the poll or anything, I'm just stating this stuff for the record.
(I use an Ubuntu and Windows dual boot on my main computer. I also have an Android phone and a Raspberry Pi.)