I haven’t needed to root a device in a while but its fairly straight forward.
The first step is to unlock your bootloader, do this by enabling developer menu (click on rom version in system settings 6 times fast) and then select to disable the booloader lock. if you cant do that then you probably cant root the device.
if you can get that far, the next step is to find a recovery for your device, youll want to boot it using fastboot and load the recovery image, that will allow you to flash SuperSU.
If you need more specific instructions Id need more info on where you get stuck (I’m just going of memory with this reply) but I know windows has some drivers that you need to install for adb to work and there might be other nuances I’m not remembering off hand
I’d also advise when searching for stuff like this, its better to avoid saying the device name unless you are limiting results to XDA or other well known android development sites.