In this hour you looked at one of the most important features of SharePoint—lists and libraries. You created site columns and content types through the user interface and through features. In addition you looked at creating custom field controls. Custom field controls provide a lot of flexibility to achieve things that out of the box SharePoint might not offer.
In addition to all this you learned how to create custom list definitions. In the next hour you explore the more advanced topics on managing data in SharePoint.