bullet spread with random.range() in unity 2018.4

I try to make weapons in unity 2D .one of them is the shotgun, so I need to make bullets spread.I used Quaternion.Euler to solve the problem but doesn't work.There is another problem in Random.Range() when I write r of Random in capital it says there is an error, also when I write it in small another error please help me. this is the code

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

public class Shooting : MonoBehaviour
{

    public Transform firePoint;
    public GameObject bulletPrefab;
    public Weapon currentWeapon;
    private float nextTimeOfFire = 0;

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
       if(Input.GetButtonDown("Fire1")){
            if(currentWeapon){
                if(Time.time >= nextTimeOfFire){
                    for(float x = 0;x < currentWeapon.bullets; x++){
                        Shoot();
                    }
                    nextTimeOfFire = Time.time + 1 / currentWeapon.fireRate;
                }
            }
       } 
    }

    void Shoot(){
        Instantiate(bulletPrefab, firePoint.position, Quaternion.Euler(firePoint.rotation.x,firePoint.rotation.y + Random.Range(-currentWeapon.spread, currentWeapon.spread), 0f));
    }
}

I'm a beginner in unity and sorry for bad English