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This guide continues with the Hello World module, demonstrating how to gradually add custom blocks (and more).
If you're feeling adventurous, you can jump straight to the Examples module. The Examples module contains many more code samples used in this guide. If you're new here, keep following this tutorial and check out the Examples modules when you're ready to dive deeper.
To explore all the really cool code and in-depth inline documentation provided by the Drupal community, try this link: http://cgit.drupalcode.org/examples/tree/page_example?h=8.x-1.x.
Also, make sure to review the relevant API documentation: