Let's identify the practical usage of action hooks for extending web application layouts. In the earlier sections, we developed the home page with three widgets with a reusable template inside a dynamic widget area. Now, we have to figure out the extendable locations of those widgets. Consider the following scenario:

Assume that we have been asked to add a button in front of each developer in the home page widget. Users who are logged into the application can click on the button to instantly follow the developers. The implementation of this requirement needs to be done without affecting or changing the other two widgets. Also, we have to plan for similar future requirements for other widgets.

The most simple and preferred way of many beginner-level developers is to create three separate templates for the widgets and directly assign the button to the widget by modifying the existing code. As a developer, you should be familiar with the open...