Again, it depends on what computer you have, as well as the capabilities of your TV (or the streaming device connected to your TV). If you have an Apple computer: The easiest way is to use AirPlay.

If you have your laptop connected to your TV via HDMI or wirelessly, but you’re not getting picture, sound, or both, there’s a few things you can do to troubleshoot the issue.

Your TV should now display what's on your laptop screen. You can choose whether you want the TV to duplicate the screen (mirroring), or extend the display if you want to carry on using your laptop ...