Check out example codes for "unity c# flip sprite". It will help you in understanding the concepts better.

Code Example 1

public Camera cam;
   public Transform aimTransform;



Vector3 mousePosition = cam.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y));
        Vector3 aimDirection = (mousePosition - transform.position).normalized;
        float angle = Mathf.Atan2(aimDirection.y, aimDirection.x) * Mathf.Rad2Deg;
        aimTransform.eulerAngles = new Vector3(0, 0, angle);

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