Your First Drupal 8(or 9!) Module
summary
Stepwise builds a roll_notices module from a blank PHP file to a working module in eight stages, adding routes, a settings Form API page, a block plugin, module permissions, and a service that centralizes get/set of notices stored via the state service. It adds cache metadata — cache contexts and tags — so updated notices re-render, offers a user-role-aware block and an edit tab on user listing, and swaps deprecated drupal_set_message plus info file changes to make the code Drupal 9–compatible; source with git tags is provided.
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