Use an HDMI cable with a USB-C adapter if your Chromebook has no HDMI port
Plug one end of the HDMI cable into the Chromebook or adapter
Plug the other end of the HDMI cable into the TV
Turn on the TV and set it to the correct HDMI input
On the Chromebook, click the time in the bottom-right corner
Open Quick Settings
Select the display or cast option if available
Choose the TV from the list of available displays
Select whether to mirror or extend the display
Adjust display settings if needed in Chromebook settings
If using wireless casting, open Chrome
Click the three-dot menu
Select Cast
Choose the TV or Chromecast device
Select the source and start casting