what to do. I am totally new for this ,I dont know what to do

[GaurangSavlani]

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngineSceneManagment;
public class SceneChanger : MonoBehaviour
{

public static int SceneNumber;

private void Start()
{


if(SceneNumber--0)
{
StartCoroutine (ToMainMenu());

}

IEnumerator ToMainMenu();
{
yield return New WaitForSeconds(5);
SceneNumber - 1;
SceneManager.LoadScene(1);

}

}

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