Creating Custom Entity Field Widget Autocomplete in Drupal

Kevin Wenger shared a comprehensive guide on Medium about creating a custom Entity Field Widget Autocomplete for internal data in Drupal. This tutorial, aimed at enhancing Drupal Admin UI custom fields like Nodes and Taxonomies, walks through creating a custom module, defining a field type, and setting up an autocomplete field widget using Drupal's Form API. 

The process involves creating a module directory and .info.yml file, then developing a form class to manage data storage and display. Wenger illustrates the setup with an "Author" field example, combining text fields and user references. Kevin also explains how to define routes, and permissions, and use the entity_autocomplete field type. Additionally, the guide covers custom selection handlers and field formatters to control data presentation on the front end, emphasizing the use of Views for flexible data retrieval.