A "Hello World" Custom Page Module
The following section will walk you through the creation of a simple module. There is a long tradition of having the first program you write in any new system sending "Hello World!" to the screen.
Although Drupal is one of the boldest, most progressive Open Source projects in existence, it is also deeply rooted in a long tradition of science and technology.
Before starting to use the code in this walk-through, please prepare the module skeleton per the instructions here: Prepare a Module skeleton
Drupal 8 Interconnections is a demo page highlighting the relationships between module components.