W3Schools has very useful information for the beginner. If you’re not familiar with the concept of OWL, you should start with this website. Many examples. Visit websites

This document demonstrates the use of the OWL language to formalize a domain by defining classes and properties of those classes, define individuals and assert properties about them, and reason about these classes and individuals to the degree permitted by the formal semantics of the OWL language. The sections are organized to present an incremental definition of a set of classes, properties and individuals, beginning with the fundamentals and proceeding to more complex language components. [...]