How to add different score when player hit different enemy,how to add different scores while player hitting different type of enemies

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

public class Enemy : MonoBehaviour
{
[SerializeField] private float moveSpeed = 5f;

// Update is called once per frame
void Update()
{
    var xPos = this.transform.position.x;
    xPos -= 0.75f * Time.deltaTime * moveSpeed;
    this.transform.position = new Vector2(xPos, this.transform.position.y);
}

private void OnTriggerEnter2D(Collider2D collision)
{
    if (collision.transform.tag.Equals("EnemyDestroyer"))
    {
        GamePlayManager.instance.MissCount();
        Destroy(gameObject);
    }

    if (collision.transform.tag.Equals("Bullet"))
    {
        Destroy(gameObject);
        GamePlayManager.instance.ScoreCount();
    }
}

}

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

public class Enemy : MonoBehaviour
{
[SerializeField] private float moveSpeed = 5f;

// Update is called once per frame
void Update()
{
    var xPos = this.transform.position.x;
    xPos -= 0.75f * Time.deltaTime * moveSpeed;
    this.transform.position = new Vector2(xPos, this.transform.position.y);
}

private void OnTriggerEnter2D(Collider2D collision)
{
    if (collision.transform.tag.Equals("EnemyDestroyer"))
    {
        GamePlayManager.instance.MissCount();
        Destroy(gameObject);
    }

    if (collision.transform.tag.Equals("Bullet"))
    {
        Destroy(gameObject);
        GamePlayManager.instance.ScoreCount();
    }
}

}

Well since you are using singeltons, you could use a public int for your score in the GamePlayManager, and a switch statement to handle scores. For example:

public static GamePlayManager instance;
public int Score;

And in your collision script:

void OnTriggerEnter2D(Collider2D collision)
{
     switch(collision.gameObject.tag)
     {
          case "EnemyDestroyer":
               GamePlayManager.instance.Score += 2;
               // Do other stuff here too
               break;

          case "SuperEnemy":
                GamePlayManager.instance.Score += 5;
                break;
     }
}

Hope that helps @kumar_reddy