get a chromecast
you can purchase a Chromecast and connect it to the HDMI port on your TV.
Ensure the Chromecast and Galaxy S7 are connected to the same Wi-Fi network.
Open the Google Play app and install the Chromecast app on your device.
Follow the wizard to setup your device with your TV.
Apps like Netflix and YouTube will now have a “Cast” Android Chromecast button button within the app that you can use to send the video to the Chromecast and TV. If you want to mirror everything on the device, open the Chromecast app, select “Menu” Menu Button, choose “Cast Screen / audio“, then select your Chromecast device in the list.