In this recipe, you added a new Text-hello GameObject to the scene. A parent Canvas and UI EventSystem will have also been automatically created. Also, note that by default, a new UI GameObject is added to the UI Layer – we can see this illustrated at the top right of the Inspector window in Figure 1.4. This is useful since, for example, it is easy to hide/reveal all UI elements by hiding/revealing this layer in the Culling Mask property of the Camera component of the Main Camera GameObject.
You set the text content and presentation properties and used the Rect Transform anchor presets to ensure that whatever way the screen is resized, the text will stay horizontally and vertically centered.