In the previous chapter, we saw how React changes the concept of separation of concerns, moving the boundaries inside components.
We also learned how React uses the elements returned by the components to display the UI on the screen.
Let's now see how we can declare our elements inside our components.
As soon as we get used to it, we realize that it is very convenient, precisely because it is similar to HTML and looks very familiar to anyone who has already created UIs on the web.
The opening and closing tags make it easier to represent nested trees of elements...