See instruction in the setup folder.
You may find the basic syntax and DAG example scripts in the Notes on Basics folder.
You may find the notes on how to interact with databases with Airflow in the Database Notes folder. You may learn how to connect Airflow with Relational Databases, Flatfile Storage, or NoSQL databases.
You may find the scripts on the exercises with Airflow in the Exercise folder.
YouTuber coder2j - Airflow Tutorial for Beginners - Full Course in 2 Hours 2022