Creating a module

The first step to extend Drupal is to create a custom module. Although the task sounds daunting, it can be accomplished in a few simple steps. Modules can provide functionalities and customizations to functionalities provided by other modules, or they can be used as a way to contain the configuration and a site's state.

In this recipe, we will create a module by defining an info.yml file, a file containing information that Drupal uses to discover extensions, and enabling the module.

How to do it...

1. Create a folder named mymodule in the modules folder in the base directory of your Drupal site. This will be your module's directory.
2. Create a mymodule.info.yml file in your module's directory. This contains metadata that identifies the module to Drupal.
3. Add a line to the name key to provide a name for the module:

name: My Module! 

4. We will need to provide the type key to define the type of extension. We provide the module value:

type: module 

5. The description key allows you to provide...