how to open a loaded scene in unity code example

Example 1: how to switch scenes unity

SceneManager.LoadScene("MyScene");

Example 2: scene manager unity

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);

    }
}