Check out example codes for "c# scene manager". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine;
using UnityEngine.SceneManagement;public class GetActiveSceneExample : MonoBehaviour
{
    void Start()
    {
        Scene scene = SceneManager.GetActiveScene();
        Debug.Log("Active Scene is '" + scene.name + "'.");
    }
}

Code Example 2

using UnityEngine;
using UnityEngine.SceneManagement;

public class ExampleScript: MonoBehaviour
{
     public string Scene; // Put int the Name of the scene you want to load :)
     // Active when the game/app starts :)
    void Start()
    {          
    SceneManager.LoadScene(Scene);

    }
}

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