Why doesn't Debug.Log() work?

Question

Unity

Downloaded unity without vs, but downloaded code with plugins. I tried to make a helloworld, something does not work.
Here is the code:

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

public class HelloUnity : MonoBehaviour
{
       void Start()
    {
        Debug.Log("Hello, Unity!");
    }
}

Answer 1

Well, for example, you did not hang a monobeh on a gameobject. Or gameobject is disabled.