Unity script API - GameObject game object, object object

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

/// <summary>
/// GameObject  The game object 
/// </summary>
public class GameObjectDemo : MonoBehaviour
{
    private void OnGUI()
    {
        // In the scene, the object is active （ The actual active state of the object ）
        //this.gameObject.activeInHierarchy;

        // The active state of the object itself （ The object is in Inspector Status in the panel ）
        //this.gameObject.activeSelf

        // Set the object to enable / Ban 
        //this.gameObject.SetActive();

        if (GUILayout.Button(" Add light source ")) 
        {
            //this.gameObject.AddComponent<Light>();
            // Create objects 
            GameObject lightGO= new GameObject();
            // Add the component 
            Light light = lightGO.AddComponent<Light>();    
            light.color = Color.red;
            light.type = LightType.Point;
        }

        // Find objects in the scene by name （ Use with caution ）
        //GameObject.Find(" Game object name ");

        // Get all objects using this tag 
        GameObject[] allEnemy = GameObject.FindGameObjectsWithTag("Enemy");
        foreach (GameObject enemy in allEnemy)
        {
            Debug.Log("Enemy"+enemy.name);
        }
          
        // Get the object using the tag （ Single ）
        GameObject playerGo = GameObject.FindWithTag("Player");
        Debug.Log("Player"+playerGo.name);

        //Object

        // Find objects by type 
        Object.FindObjectOfType<MeshRenderer>();
        FindObjectsOfType<MeshRenderer>();

        // Destroy object 
        //Object.Destroy

        // practice ： Find the enemy with the lowest HP 
    }

}