Optimizing Code

HI, so I've been learning c# for the past weeks and it's been a nice journey. I have this Code that I've made using tutorials and myself and I'm pretty sure is not optimized at all. I've realized that following tutorials from A to D only makes me start copy pasting code as I reach point E so I decided to try to get as much as I could do myself searching on the internet and solving problems myself instead of follwing thos tutorials, however there is a limit on what I can do and I'm pretty sure I've made the code not optimized at all since my problem solving is not good, so I'd like to ask for help in how to optimize this.

public class Weapon : MonoBehaviour {

 [Header("ShotPoint")]
 public Transform horizontalShotPoint;
 public Transform VerticalShotPoint;
 
 [Header("CanShoot")]
 public bool xCanShoot = true;
 public bool yCanShoot = true;

 [Header("Recoil")]
 public float horizontalRecoil;
 public float verticalRecoil;

 [Header("Projectile")]
 public GameObject Projectile;
 public float xProjectileSpeed;
 public float yProjectileSpeed;

 [Header("Cooldown")]
 public float horizontalStartTimeBtwShots;
 public float VerticalStartTimeBtwShots;

 Rigidbody2D rb;
 Player player;
 private float timeBtwShots;

 void Start() {
     rb = GetComponent<Rigidbody2D>();
     player = GetComponent<Player>();
 }

 void Update() {
     if(timeBtwShots <= 0) {
         if(Input.GetKey(KeyCode.DownArrow)) {
             xCanShoot = false;
         } else {
             xCanShoot = true;
         }
         if(Input.GetButtonDown("Fire1") && xCanShoot) {
             horizontalShoot();
             timeBtwShots = horizontalStartTimeBtwShots;
         } else if (Input.GetKey(KeyCode.DownArrow) && Input.GetButtonDown("Fire1") && yCanShoot){
             CooldownBar.isntance.UseStamina(100);
             player.anim.SetBool("ShootDown", true);
             VerticalShoot();
             timeBtwShots = VerticalStartTimeBtwShots;
         }
     } else {
         timeBtwShots -= Time.deltaTime;
     }
 }
 
 void horizontalShoot() {
     if(player.facingRight == true) {
         rb.AddForce(new Vector2(-horizontalRecoil, 0));
         GameObject go = (GameObject)Instantiate(Projectile, horizontalShotPoint.position, horizontalShotPoint.rotation);
         go.GetComponent<Projectile>().xSpeed = xProjectileSpeed;
         go.GetComponent<Projectile>().ySpeed = 0f;
     } else {
         rb.AddForce(new Vector2(horizontalRecoil, 0));
         GameObject go = (GameObject)Instantiate(Projectile, horizontalShotPoint.position, horizontalShotPoint.rotation);
         go.GetComponent<Projectile>().xSpeed = -xProjectileSpeed;
         go.GetComponent<Projectile>().ySpeed = 0f;
     }
 }

 void VerticalShoot() { 
     rb.AddForce(new Vector2(0, verticalRecoil));
     GameObject go = (GameObject)Instantiate(Projectile, VerticalShotPoint.position, VerticalShotPoint.rotation);
     go.GetComponent<Projectile>().ySpeed = -yProjectileSpeed;
     go.GetComponent<Projectile>().xSpeed = 0f;
 }

}

public class Projectile : MonoBehaviour {

 [HideInInspector] public float xSpeed;
 [HideInInspector] public float ySpeed;

 public float lifeTime;
 public float distance;
 public LayerMask whatIsSolid;

 public GameObject destroyEffect;

 void Start() {
     Invoke("DestroyProjectile", lifeTime);
 }

 void Update() {
     RaycastHit2D hitInfo = Physics2D.Raycast(transform.position, transform.up, distance, whatIsSolid);
     if(hitInfo.collider != null) {
         if(hitInfo.collider.CompareTag("Ground")) {
             DestroyProjectile();
         }
     }

     Vector2 position = transform.position;
     position.x += xSpeed;
     position.y += ySpeed;
     transform.position = position;
 }

 void DestroyProjectile() {
     Instantiate(destroyEffect, transform.position, Quaternion.identity);
     Destroy(gameObject);
 }

}

these are a bullet code and a weapon code.