Creating a module

The first step to extending 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 for 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 its modulename.info.yml file, a file containing information that Drupal uses to discover extensions and install the module.

How to do it…

1. In your web/modules directory, create a new directory called custom and then another directory named mymodule inside it. This will be your module’s directory. Using the command line, you may create the directory with the following command:

   mkdir -p web/modules/custom/mymodule

This will create the required directories.

2. Create a mymodule.info.yml file in your module’s directory. This will contain the metadata...