Check out example codes for "unity create gameobject from prefab in script". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine;

public class example : MonoBehaviour
{
	public GameObject prefab;
    
	// Start is called before the first frame update
	void Start()
	{
		Instantiate(prefab, new Vector3(0, 0, 0), Quaternion.identity);
	}
}

Code Example 2

Instantiate(myPrefab, new Vector3(0, 0, 0), Quaternion.identity);

Code Example 3

Instantiate(cube, Vector3 (x, y, 0), Quaternion.identity);

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