GameManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour {
    static GameManager instance;
    public void startGame() {
        SceneManager.LoadScene("Cutscene01", LoadSceneMode.Single);
    }

    public void goToMenu() {
        SceneManager.LoadScene("Menu", LoadSceneMode.Single);
    }

    private void Awake() {
        // DontDestroyOnLoad(gameObject);
    }
}