Use the Samsung SmartThings App to control TVs and projectors.
Use the LG ThinQ (formerly LG TV Plus) app to manage settings and inputs. Universal Remote Phone
The method you use depends on whether your devices are "Smart" (connected to Wi-Fi) or "Non-Smart" (use infrared). Use the Samsung SmartThings App to control TVs
Most major brands have dedicated apps that offer advanced features like keyboard typing and voice control. Universal Remote Phone
Download their official apps from the Google Play Store or Apple App Store. For Any TV (Universal Apps)