In this chapter, you learned about state and properties in React components. You started off by defining and comparing the two concepts. Then, you implemented several React components and manipulated their state. Next, you learned about properties by implementing code that passed property values from JSX to the component. Next, you were introduced to the concept of a container component, used to decouple data fetching from rendering content. Finally, you learned about the new context API in React 16 and how to use it to avoid introducing indirection in your components.

In the next chapter, you'll learn about handling user events in React components.