Check out example codes for "loadscene unity". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine.SceneManagement;

//Put this in whenever you want to load a scene
SceneManager.LoadScene("Scene name");

Code Example 2

using UnityEngine;
using UnityEngine.SceneManagement;

public class Singleplayer : MonoBehaviour
{
    public void LoadNextLevel()
    {
    	//This will load the next scene in the buildIndex, e.g if in scene 3, go to scene 4
        SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex +1);
    }
}

Code Example 3

using UnityEngine.SceneManagement;

int buildIndex = 0;
//Load the scene with a build index
SceneManager.LoadScene(buildIndex);

Code Example 4

SceneManager.LoadScene (sceneBuildIndex:/*Put the number here*/);

Code Example 5

using UnityEngine.SceneManagement;

SceneManager.LoadScene('Scene');

Code Example 6

using UnityEngine.SceneManagement


public class LoadScene : MonoBehavior
{
	public string sceneToLoad = "Level2";
    
    public void Start()
    {
    	SceneManager.LoadScene(sceneToLoad);
    }
}

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