Ontologies play a central role in digitization. But what do we mean by ontologies, how are they structured, why are they so important? For a better understanding of these and other questions, we recommend a Lecture on Knowledge Graphs from FIZ Karlsruhe to all users. The lecture is free of charge and in English. If you only want to learn more about ontologies, you can access the following links.

For a basic knowledge of ontologies:

• 3.1 Ontology in Philosophy and Computer Science - 20 minutes
• 3.2 Ontology Types - 16 minutes
• 3.9 DL and the Open World Assumption
• 3.13 Extra - A Brief History on Ontology - 30 minutes

For a basic knowledge of ontology design:

• 4.8 Putting Everything together - Ontology Design with Web Protégé
• 5.2 Ontology Design Methodologies - 17 minutes
• 5.5 Ontology Evaluation - 28 minutes
• 5.6 Extra - More Ontology Design Methodologies - 23 minutes
• 5.7 Extra - More Ontology Evaluation - 28 minutes
• 5.8 Extra - More Ontology Evaluation 2 - 33 minutes

For an expert knowledge of ontology design:

• 3.7 Description Logics - 29 minutes
• 3.8 Inference and Reasoning - 16 minutes
• 4.12 Extra - OWL Profiles - 12 minutes
• and all lectures on RDF, RDFS, OWL, and SPARQL