How to Keep Score in UnityA Basic Game Tutorial

Source Code for CupGame.cs

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

public class CupGame : MonoBehaviour{
    public int Score;
    public Text ScoreText;

    // Update is called once per frame
    void Update(){
        if(Score >= 5){
            YouWin();
        }
        
    }
    void YouWin(){
        ScoreText.text = "You Win!";
        Time.timeScale = 0f;
    }
    private void OnTriggerEnter2D(Collider2D other){
        Destroy(other.gameObject);
        AddScore();
    }

    void AddScore(){
        Score++;
        ScoreText.text = Score.ToString();
    }
}

Source Code for DeployBall.cs

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

public class DeployBall : MonoBehaviour{

    public GameObject asteroidPrefab;
    public float respawnTime = 0.3f;
    private Vector2 screenBounds;

    // Use this for initialization
    void Start() {
        screenBounds = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));
        StartCoroutine(asteroidWave());
    }
    private void spawnEnemy() {
        GameObject a = Instantiate(asteroidPrefab) as GameObject;
        a.transform.position = new Vector2(Random.Range(-screenBounds.x, screenBounds.x), screenBounds.y * 1.5f);
    }
    IEnumerator asteroidWave() {
        while (true) {
            yield return new WaitForSeconds(respawnTime);
            spawnEnemy();
        }
    }
}

Source Code for Ball.cs

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

public class Ball : MonoBehaviour {
    private Vector2 screenBounds;

    // Use this for initialization
    void Start() {
        screenBounds = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));

    }

    // Update is called once per frame
    void Update() {
        if (transform.position.y < screenBounds.y * -2) {
            Destroy(this.gameObject);
        }
    }
}

Source Code for MoveObjectRBDesktop.cs

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

public class MoveObjectRBDesktop : MonoBehaviour {
    public GameObject objectToMove; //object that you want to move - drag in inspector
    public float moveSpeed = 20.0f; //adjust this based on how fast you want your object to move

    private Vector2 movement; 
    private bool TwoD = false;
    private Rigidbody rb;
    private Rigidbody2D rb2d;

    // Use this for initialization
    void Start(){
        if (objectToMove == null){
            //error reporting
            Debug.Log("Drag the object you want to move into the inspector under 'Object To Move'");
            objectToMove = gameObject;
        }
        if (objectToMove.GetComponent<Rigidbody2D>() != null){
            rb2d = objectToMove.GetComponent<Rigidbody2D>();
            TwoD = true;
        }else if (objectToMove.GetComponent<Rigidbody>() != null){
            rb = objectToMove.GetComponent<Rigidbody>();
        }else{
            Debug.Log("Assign either a RigidBody2D or RigidBody to your player object. Defaulting to RigidBody");
            rb = objectToMove.AddComponent<Rigidbody>();
        }
    }
    void Update(){
        movement = new Vector2(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"));
    }
    void FixedUpdate(){
        moveCharacter(movement);
    }
    void moveCharacter(Vector2 direction){
        if (TwoD){
            rb2d.MovePosition((Vector2)transform.position + (direction * moveSpeed * Time.deltaTime));
        }else{
            rb.MovePosition((Vector2)transform.position + (direction * moveSpeed * Time.deltaTime));
        }
    }
}

Source Code for ScreenBounds.cs

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

public class ScreenBounds : MonoBehaviour {
    public Camera MainCamera; //be sure to assign this in the inspector to your main camera
    private Vector2 screenBounds;
    private float objectWidth;
    private float objectHeight;
    private bool isOrthographic;

    // Use this for initialization
    void Start(){
        if(MainCamera == null){
            MainCamera = Camera.main;
        }
        isOrthographic = MainCamera.orthographic;
        screenBounds = MainCamera.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, MainCamera.transform.position.z));
        objectWidth = transform.GetComponent<SpriteRenderer>().bounds.extents.x; //extents = size of width / 2
        objectHeight = transform.GetComponent<SpriteRenderer>().bounds.extents.y; //extents = size of height / 2
    }

    // Update is called once per frame
    void LateUpdate(){
        Vector3 viewPos = transform.position;
        if(isOrthographic){
            viewPos.x = Mathf.Clamp(viewPos.x, screenBounds.x * -1 + objectWidth, screenBounds.x - objectWidth);
            viewPos.y = Mathf.Clamp(viewPos.y, screenBounds.y * -1 + objectHeight, screenBounds.y - objectHeight);
        }
        else{
            viewPos.x = Mathf.Clamp(viewPos.x, screenBounds.x + objectWidth, screenBounds.x * -1 - objectWidth);
            viewPos.y = Mathf.Clamp(viewPos.y, screenBounds.y + objectHeight, screenBounds.y * -1 - objectHeight);
        }
        transform.position = viewPos;
    }
}