how to get the mouse posiont unity code example

Example 1: unity get mouse position

Vector3 worldPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);

Example 2: unity ray from mouse position

RaycastHit hit;
Ray ray = camera.ScreenPointToRay(Input.mousePosition);

if (Physics.Raycast(ray, out hit)) {
  Transform objectHit = hit.transform;

  // Do something with the object that was hit by the raycast.
}