Unity writes a character controller. The mouse controls the screen to shake and the mouse controls the shooting

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

public class two: MonoBehaviour {

  
        public GameObject _prefabBullet;
        private float _angleSpeed = 120f;
        void Update()
        {
            float eularY = Input.GetAxis("Mouse X") * _angleSpeed * Time.deltaTime;
            transform.Rotate(new Vector3(0, eularY, 0));
            if (Input.GetMouseButtonDown(0))
            {
                Instantiate(_prefabBullet, transform.position, transform.rotation);
            }
        }
       
    
}