how to make a tutorial scene appear once in unity code example

Example: how to make a tutorial scene appear once in unity

using System; using UnityEngine; using UnityEngine.SceneManagement;  public class GameLaunchCounter : MonoBehaviour {     string SessionNumber = PlayerPrefs.GetString("unity.player_session_count");          private void Start()     {         if (SessionNumber == "0")         {             SceneManager.LoadScene("Tutorial");              else             {                 SceneManager.LoadScene("SomethingElse")             }          }     } }