How to make a Variable gloabal in c#?

OK, so i have a complex script. A money script to be exact. It uses moneytext for its text. I cannot figure out how to link those 2 to anthoer script then use them then send it back to my other script. Would this be possible if so how? I am having some trouble and i understand a tiny amount of it Money Script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class MoneyManager : MonoBehaviour {
 
     public BuySystem Guns;
     public static int Money;                      // Makes money value accessible to more than one script
     public  Text moneyText;                     // Adds a text for money
 
     void Start()                               // Teells the system for everything in brackets to start 
     {
         Money = 0;
         moneyText.text = Money.ToString();     // Tells the text to refresh it with the Money number
     }
 
     void Update()                              //Makes sure to constantly check values
     {
         if (Input.GetButtonDown("Fire1"))      // If player presses left-click, Adds money
         {
             Money += 100;
             moneyText.text = Money.ToString(); // Tells the text to refresh it with the Money number
         }
         if (Input.GetButtonDown("Fire2"))      // If player presses right-click, Subtracts money
         {
             Money -= 1;                        // Money to Subtract
 
             if (Money < 0)                     // Makes Sure number cant go lower than -1
             {
                 Money = 0;                     // If money is less than 0 replaces it with 0
             }
             if (Money < -1 )                   // Makes Sure number cant go lower tahn 0
             {
                 Money = 0;                     // If money is lower than 0 replaces it with 0
             }
             moneyText.text = Money.ToString(); // Tells the text to refresh it with the Money number
         }
     }
 
        // TODO : CONNECT THIS SCRIPT WITH SHOPCOLLIDER WHEN I WAKE UP, also set gun prices. 
 }
 

I cant figure out how to link Money. and Moneytext to this other script then that other scripts uses MoneyText and Money fore itself. The one problem i have is that when i make MoneyText static it removes it from the editor. The UI text i have is called "Money Text" from the canvas. Buy Script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 [System.Serializable]
 public class BuySystem
 {
 
     public GameObject Gun;
     public int Cost;
     public static Text moneyText;
 
     void Start ()
     {
         moneyText.text = MoneyManager.Money.ToString();
     }
     void Update ()
     {
     if (Input.GetKeyDown("p"))
         {
             if (MoneyManager.Money >= Cost)
             {
                 MoneyManager.Money -= Cost;
                 Debug.Log("PurcaseComplete");
                 moneyText.text = MoneyManager.Money.ToString();
             }
         }
 
         if (Input.GetKeyDown("C"))
         {
             MoneyManager.Money += 10;
             moneyText.text = MoneyManager.Money.ToString();
         }
     }
      // TODO : FIND OUT HOW TO USE C# VARIABLES GLOBALLY
 }