Overriding List.Contains Equals() for a custom class

I'm making a A* pathfinding so i made a Node class and i have a list with all the Nodes but i need to use the function .Constains and for that i have to override Equals() in the Node class and i have been looking everywhere but everyone makes it different so i'm really confused.

Here is what i've done, but it doesn't work so i really need someone that tells me what's wrong please :)

 using System.Collections;
 using UnityEngine;
 using System.Collections.Generic;
 
 public class Node : object {
 
     public Node parentNode;
 
     public int nodeX;
     public int nodeY;
     public Vector2 nodePosition;
 
     public bool state;
     
     public int gCost;
     public int hCost;
     public int fCost;
 
     public Node(int x, int y){
         nodeX = Mathf.RoundToInt(x);
         nodeY = Mathf.RoundToInt(y);
         nodePosition = new Vector2(nodeX, nodeY);
     }
 
     public void SetCost(Node end){
         if(parentNode != null){
             gCost =(int) parentNode.gCost + 10;
         }
         else{
             gCost = 10;
         }
         
         hCost =(int) (Mathf.Abs(nodeX - end.nodeX) + Mathf.Abs(nodeY-end.nodeY));
         fCost =(int) gCost + hCost;
     }
  
     public bool Equals (Node other){
         if((object)other == null)
             return false;
         return this.nodePosition == other.nodePosition;
     }
 
     public override bool Equals(System.Object other){
         if(other == null)
             return false;
 
         Node node = other as Node;
         if((System.Object)node == null)
             return false;
 
         return this.nodePosition == node.nodePosition;
     }
     
     public override int GetHashCode(){
         return base.GetHashCode();
     }
 
     
 }