Basic shooting in Unity

This post is about how to add simple shooting functionality in Unity.
We will use a bullet prefab with Rigidbody2D component and Instantiate() method to add the bullet and make it fly.
In this example we also use a basic particle system to add shooting flash.

Our machine gun object has 2 children objects. First empty child is an aim, the other child is a particle system.

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

public class Shoot : MonoBehaviour
    [SerializeField] GameObject bulletPrefab;
    [SerializeField] Transform aim;
    ParticleSystem ps;
    void Start(){
        ps = GetComponentInChildren<ParticleSystem>();

    void Update(){

    void ShootBullet(){
        GameObject bullet = Instantiate(bulletPrefab, aim.position, Quaternion.identity);
        bullet.GetComponent<Rigidbody2D>().AddForce(new Vector2(10f, 0f), ForceMode2D.Impulse);

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