Welcome! Today, we'll journey deeper into React, focusing on props, state updates, and conditional state updates. Our itinerary includes:

1. A review of props.
2. An explanation of the previous state.
3. The handling of state updates based on the previous state.
4. Conditional state updates based on the previous state.

In our React journey, props act as a suitcase, carrying items from parent to child components. However, props are read-only—the data passed from the parent to the child should not be changed by the child.

In this example, ParentComponent sends a message via props to ChildComponent, which then displays it.

In React, the previous state helps us understand changes in state over time. When managing React state, the concept of the previous state becomes crucial due to the asynchronous nature of events.