Connecting to External Databases in Craft CMS

Andrew and Ryan show how to connect to an external database from Twig.

Craft 4, Craft 5

Craft CMS Extending Craft

Some stuff to help you along during the lesson:

Connecting to a Database in Craft CMS
SQLite sample project by Andrew
SQLite
SQLite sample database
SQLite Driver for Yii Database
Craft Autocomplete