public Vector3 steeringTarget { get; }

This is typically the next corner along the path or the end point of the path.

Unless the agent is moving on an OffMeshLink, there is a straight path between the agent and the steeringTarget.

When approaching an OffMeshLink for traversal - the value is the position where the agent will enter the link. While agent is traversing an OffMeshLink the value is the position where the agent will leave the link.