This tutorial guides developers on how to create a cross-platform video call app using the Agora React Native SDK. The process involves creating an account on the Agora platform, generating an App ID, and setting up the project structure for the React Native application. The developer then installs the necessary dependencies, sets up the camera and microphone permissions, and initializes the RTC engine using the App ID. The tutorial covers the core logic of the video call, including defining a class-based component to store the instance of the RtcEngine, handling user event states, and rendering the local and remote users' video feeds. With these steps, developers can build a custom React Native calling app that maintains low latency, load balancing, and cross-platform compatibility.