If you want to skip ahead, there are also a few ways to get Home Assistant running that don’t need any level of Linux competency:
They sell their own devices that are more or less plug & play.
Installing Home Assistant OS on a Raspberry Pi is just flashing the image onto an SD card.
Installing Home Assistant OS onto a dedicated device involves shortly booting into Linux from USB to flash Home Assistant OS onto the internal disk.
If you don’t want to run Home Assistant OS, and instead want to run Home Assistant as one of several applications running on a Server, that’s when you need to start getting comfortable administrating a Linux server.