A:Answer You can use a mobile phone (Android 6.0 or higher, iOS 12 or higher) to connect to Chromecast with Google TV using the Google Home app via Wi-Fi connection. For more information on Chromecast requirements, click here: https://support.google.com/chromecast/answer/7022492
You may also cast from your laptop using the Chrome browser. However, connecting Chromecast to a laptop as your alternative monitor will not work, as Chromecast requires an HDMI input. You can follow the steps here for casting using a Chrome browser: https://support.google.com/chromecast/answer/3228332