This article explains how to send content from your Android or iOS device to your TV using a Google Chromecast streaming device connected to the HDMI port on your TV.
How to Set Up Chromecast on iPhone and Cast to TV with Google Home
Setting up your Chromecast device is simple, but does require a few steps.
Connect the Chromecast dongle to the HDMI port on your TV and connect the USB power cable to a compatible port on your TV or to a wall outlet.
Go to Google Play Store or Apple App Store on your mobile device and download the Google Home app. Most Android devices have Chromecast pre-installed.