If you want to mirror/extent your display to the TV screen, grab a normal HDMI cable or a VGA cable.
Attach one end of it to the back of the TV (where there are ports) and the other end to your PC (if you don't have a HDMI port for your PC, you need to use an adapter)
When done, your PC screen will be displayed on the TV. If it doesn't, press the TV or HDMI button on the TV remote.
You can control how the screen should be displayed through Settings > System > Display > Multiple displays.
Or, just press Windows+P.
Regards,