The inexpensive Google Chromecast (2013) is able to display YouTube and other Apps from Android smartphones like the LG Google Nexus 5X on to Smart TVs using Wi-Fi which makes it a popular casting device.
To link the Google Chromecast (2013) with the LG Google Nexus 5X, make sure that you have connected the Chromecast to one of the HDMI ports of the TV and powered on the Chromecast by attaching the USB cable to a TV USB port or a USB power adapter. You also need to make sure your TV is powered up, and the HDMI input of your TV is the same port that you connected the Chromecast to.
Next, you need to download and install the Google Chromecast (2013)'s App on the LG Google Nexus 5X from Google Play Store. Note that Google has changed the name of the Google Cast App to 'Google Home'. You can click here to see how to set up the Google Chromecast (2013).
Open the Google Home App and click the top right menu icon -> Cast screen / audio -> CAST SCREEN / AUDIO. From there the App will start to search for the Google Chromecast (2013).
You can select your Chromecast model once it is found, and the casting connection process will start. Once the casting connection is established, you should be able to see the LG Google Nexus 5X's screen on the TV connected to the Google Chromecast (2013).
The Google Chromecast (2013) can be easily set up from the LG Google Nexus 5X to wirelessly mirror the phone's screen on a larger TV screen, enabling heavy YouTube users or movie enthusiasts to enjoy shows with friends.