MainMenu.cs

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

public class MainMenu : MonoBehaviour
{
    [SerializeField] string goalkeeperModeScene;
    [SerializeField] string shootModeScene;
    [SerializeField] string MultipleModesModeScene;
    [SerializeField] string mainMenuScene;
    public void LoadGoalkeeperModeScene()
    {
        SceneManager.LoadScene(goalkeeperModeScene, LoadSceneMode.Single);
    }

    public void LoadshootModeScene()
    {
        SceneManager.LoadScene(shootModeScene, LoadSceneMode.Single);
    }

    public void LoadMultipleModesMode()
    {
        SceneManager.LoadScene(MultipleModesModeScene, LoadSceneMode.Single);
    }

    public void LoadMainMenuScene()
    {
        SceneManager.LoadScene(mainMenuScene, LoadSceneMode.Single);
    }
}