How can I root my Lenovo Tab 4 10 (TB—X304L)?

I've been trying to root my Lenovo Tablet for past few weeks and I've got no success. I found out an article in XDA showing how to root it but when I tried I got stuck in the third step which was unlocking the bootloader. When I typed fastboot oem unlock-go in my laptop and hit enter the adb and fastboot software just kept displaying *"waiting for device"* and nothing happened. I have been searching whole internet to find a reliable tutorial because I am a newbie in this rooting thing. Even One Click Root doesn't have any solution. And I don't want to have any spywares in my device therefore I don't want to root it through any one click root services (like One click root, King Root, etc) I apologize if I am missing something. *Any help would be highly appreciated.* Edit:— It seems like the OP of this post faced the same problem. Can anyone tell me how to use the sudo code? I will try to install the drivers (as pointed out by an answer) and then edit here.