how to add sound to unity

How do I code the script to make a sound when the knife hits an object and after a failed attempt? This is my script to run the entire game:

 using System.Collections;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 
 
 [RequireComponent(typeof(GameUI))]
 public class GameController : MonoBehaviour
 {
 
  
     public static GameController Instance { get; private set; }
 
     [SerializeField]
     private int knifeCount;
 
     [Header("Knife Spawning")]
     [SerializeField]
     private Vector2 knifeSpawnPosition;
     [SerializeField]
     
     private GameObject knifeObject;
 
     
     public GameUI GameUI { get; private set; }
 
     private void Awake()
     {
         
         Instance = this;
 
         GameUI = GetComponent<GameUI>();
     }
 
     private void Start()
     {
         
         GameUI.SetInitialDisplayedKnifeCount(knifeCount);
         
         SpawnKnife();
     }
 
     
     public void OnSuccessfulKnifeHit()
     {
         if (knifeCount > 0)
         {
             SpawnKnife();
         }
         else
         {
             StartGameOverSequence(true);
         }
     }
 
     
     private void SpawnKnife()
     {
         knifeCount--;
         Instantiate(knifeObject, knifeSpawnPosition, Quaternion.identity);
     }
 
    
     public void StartGameOverSequence(bool win)
     {
         StartCoroutine("GameOverSequenceCoroutine", win);
     }
 
        
     private IEnumerator GameOverSequenceCoroutine(bool win)
     {
         if (win)
         {
             
             yield return new WaitForSecondsRealtime(0.3f);
             FindObjectOfType<LevelLoader>().LoadNextLevel();
 
         }
         else
         {
             GameUI.ShowRestartButton();
         }
     }
 
     public void RestartGame()
     {
         
         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex, LoadSceneMode.Single);
     }
 }

and this is the script for the knife:

 using UnityEngine;
 
 public class KnifeScript : MonoBehaviour
 {
 
     [SerializeField]
     private Vector2 throwForce;
 
     //knife shouldn't be controlled by the player when it's inactive 
     //(i.e. it already hit the log / another knife)
     private bool isActive = true;
 
     //for controlling physics
     private Rigidbody2D rb;
     //the collider attached to Knife
     private BoxCollider2D knifeCollider;
 
     private void Awake()
     {
         rb = GetComponent<Rigidbody2D>();
         knifeCollider = GetComponent<BoxCollider2D>();
     }
 
     void Update()
     {
         //this method of detecting input also works for touch
         if (Input.GetMouseButtonDown(0) && isActive)
         {
             //"throwing" the knife
             rb.AddForce(throwForce, ForceMode2D.Impulse);
             //once the knife isn't stationary, we can apply gravity (it will not automatically fall down)
             rb.gravityScale = 1;
             //Decrement number of available knives
             GameController.Instance.GameUI.DecrementDisplayedKnifeCount();
         }
     }
 
     private void OnCollisionEnter2D(Collision2D collision)
     {
         //we don't even want to detect collisions when the knife isn't active
         if (!isActive)
             return;
 
         //if the knife happens to be active (1st collision), deactivate it
         isActive = false;
 
         //collision with a log
         if (collision.collider.tag == "Log")
         {
             //play the particle effect on collision,
             //you don't always have to store the component in a field...
             GetComponent<ParticleSystem>().Play();
 
             //stop the knife
             rb.velocity = new Vector2(0, 0);
             //this will automatically inherit rotation of the new parent (log)
             rb.bodyType = RigidbodyType2D.Kinematic;
             transform.SetParent(collision.collider.transform);
 
             //move the collider away from the blade which is stuck in the log
             knifeCollider.offset = new Vector2(knifeCollider.offset.x, -0.4f);
             knifeCollider.size = new Vector2(knifeCollider.size.x, 1.2f);
 
             //Spawn another knife
             GameController.Instance.OnSuccessfulKnifeHit();
         }
         //collision with another knife
         else if (collision.collider.tag == "Knife")
         {
             //start rapidly moving downwards
             rb.velocity = new Vector2(rb.velocity.x, -2);
             //Game Over
             GameController.Instance.StartGameOverSequence(false);
         }
     }
 }