How to access variables from scripts on different objects then display it on a textmesh?

Hello I've been really stumped on how I can display how much ammo a gun has on the text mesh component on the canvas gameObject. I've been searching for solutions all day but I just can't find anything. First I need to access the Ammo variable from a different script and then display that variable on a different component. I have no clue how to get variables from separate scripts on a different object. If anyone could help me with a C# example that would be awesome. My gun script is down below if anyone needs a reference, sorry if it's messy or bad

using System.Collections; using System.Collections.Generic; using UnityEngine; public class Weapon : MonoBehaviour { public float fireRate = 0.5f; //How fast the weapon fires public int Ammo = 3; //How much ammo the weapon fires public float timeToFire = 0.0f; //used for firerate public Transform ejectPoint; //where the bullets are ejected public GameObject bullet; //the bullet object that is spawned public int ReloadAmount = 10; //how much is reloaded at a time // Use this for initialization void Start () { } // Update is called once per frame void Update () { if (fireRate == 0 && Ammo >= 1) { //If it's 0 then it's a semi-auto if (Input.GetButtonDown ("Fire1")) { Instantiate (bullet, ejectPoint.position, ejectPoint.rotation); Ammo = Ammo - 1; } } else if (Input.GetButton ("Fire1") && Time.time >= timeToFire && Ammo >= 1) { //If it's any other positive number then it's auto timeToFire = Time.time + fireRate; Instantiate (bullet, ejectPoint.position, ejectPoint.rotation); Ammo = Ammo - 1; } if (Input.GetButtonDown ("Fire2")) { //Reloading thing Debug.Log ("Reloading..."); Ammo = Ammo + ReloadAmount; } } }