Migrate is in core now. In this session we'll learn how to migrate content into Drupal from different sources, including (but not limited to) an existing Drupal 7 site, MySQL tables or CSV files. MIGRATE. ALL. THE. THINGS.
This session will assume that you know how to install and create a module in Drupal 8. Some knowledge of OOP would be great, too. Knowing that things like CSV, MySQL, or XML exist will help, too.