1. Bolstad Textbook:  Chapter 8 (pgs. 307-341) & Chapter 13 (521 - 556)
2. An overview of the Geodatabase (read all subsections) - http://desktop.arcgis.com/en/desktop/latest/manage-data/geodatabases/what-is-a-geodatabase.htm 
3. A quick tour of Attribute Domains - http://desktop.arcgis.com/en/desktop/latest/manage-data/domains/an-overview-of-attribute-domains.htm
4. A quick tour of Subtypes - ​http://desktop.arcgis.com/en/desktop/latest/manage-data/subtypes/an-overview-of-subtypes.htm
5. What is Annotation - ​http://desktop.arcgis.com/en/desktop/latest/manage-data/annotations/what-is-annotation.htm
6. ​Relationships & ArcGIS - ​http://desktop.arcgis.com/en/desktop/latest/manage-data/relationships/relationships-and-arcgis.htm
7. Topology Basics - ​http://desktop.arcgis.com/en/desktop/latest/manage-data/topologies/topology-basics.htm
8. Model Builder (read all subsections) - http://desktop.arcgis.com/en/desktop/latest/analyze/modelbuilder/what-is-modelbuilder.htm