Check out example codes for "instantiate offset unity". It will help you in understanding the concepts better.

Code Example 1

// C#
 
 public GameObject objectPrefab;
 
 // ...
 
 // Example using Start function
 void Start()
 {
     // Use the prefab's position and rotation
     Instantiate(objectPrefab, objectPrefab.position, objectPrefab.rotation);
     
     // Override the prefab's coordinates (with zero-coordinates)
     Instantiate(objectPrefab, Vector3.zero, Quaternion.identity);
     
     // Provide an offset to the stored values
     Instantiate(objectPrefab, objectPrefab.position + (Vector3.up * 1.63f), objectPrefab.rotation * Quaternion.AngleAxis(30.0f, Vector3.up));
 }

Code Example 2

if ( structureIndex == 0 )
                    {    
                        var offset : Vector3 = new Vector3(0.5f, 0.5f, 0);
                        Instantiate(allStructures[structureIndex], lastHitObj.transform.position + offset, Quaternion.identity );                    
                    }

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