Check out example codes for "how to find gameobjects in unity". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine;
using System.Collections;
// This returns the GameObject named Hand in one of the Scenes.
public class ExampleClass : MonoBehaviour
{
    public GameObject hand;    
    
    void Example()
    {
        // This returns the GameObject named Hand.
        hand = GameObject.Find("Hand");        
      
        // This returns the GameObject named Hand.
        // Hand must not have a parent in the Hierarchy view.
        hand = GameObject.Find("/Hand");     
      
        // This returns the GameObject named Hand,
        // which is a child of Arm > Monster.
        // Monster must not have a parent in the Hierarchy view.
        hand = GameObject.Find("/Monster/Arm/Hand");
        
        // This returns the GameObject named Hand,
        // which is a child of Arm > Monster.
        hand = GameObject.Find("Monster/Arm/Hand");
    }
}

Code Example 2

using UnityEngine;
using System.Collections;// This returns the GameObject named Hand in one of the Scenes.public class ExampleClass : MonoBehaviour
{
    public GameObject hand;    void Example()
    {
        // This returns the GameObject named Hand.
        hand = GameObject.Find("Hand");        // This returns the GameObject named Hand.
        // Hand must not have a parent in the Hierarchy view.
        hand = GameObject.Find("/Hand");        // This returns the GameObject named Hand,
        // which is a child of Arm > Monster.
        // Monster must not have a parent in the Hierarchy view.
        hand = GameObject.Find("/Monster/Arm/Hand");        // This returns the GameObject named Hand,
        // which is a child of Arm > Monster.
        hand = GameObject.Find("Monster/Arm/Hand");
    }
}

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