Output "Hello World" on page using Drupal module
In the next section, we will look at creating a simple module. There is a long-standing tradition that the first program you write in any new system displays "Hello World!" on the screen.
Although Drupal is one of the boldest and most progressive open source projects, it is also deeply rooted in long-standing scientific and technical traditions.
Before you begin using the code in this step-by-step guide, prepare the module scaffold according to the instructions provided here: Preparing the Module Scaffold
Drupal 8 Interconnections is a demo page that highlights the relationships between module components.
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