Laravel - if selected brand 1 than models 1

I have this small website car project and I need in my create.blade.php to have unique selections, for example:

...
<div class="column">
   <label for="brand">Brand</label></br>
   <select class="form-control" id="soflow" name="brand">
      <option value="" disabled selected>Select your option</option>
      <option value="Volkswagen">Volkswagen</option>
      <option value="BMW">BMW</option>
      <option value="Audi">Audi</option>
   </select>
</div>
</br>
<div class="column">
  <label for="model">Model</label></br>
  <select class="form-control" id="soflow" name="model">
     <option value="" disabled selected>Select your option</option>
     <option value="Golf1">Golf 1</option>
     <option value="Golf2">Golf 2</option>
     <option value="Golf3">Golf 3</option>
  </select>
</div>
...

So if user select Volkswagen on another select it shows him Models for Volkswagen: Golf 1, Golf 2, Golf 3... And if user for example select Audi it needs to show him models for Audi on next selection. How can I do this? Is there any if statement or something like that?

EDITED:

My PostsController.php :

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Post;

class PostsController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $posts = Post::all();
        return view('welcome')->with('posts', $posts);
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('create');
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $this->validate($request, [
            'title' => 'required',
            'brand' => 'required',
            'model' => 'required',
            'safety' => 'required',
            'equipment' => 'required',
            'condition' => 'required',
            'price' => 'required',
            'priceoption' => 'required'
        ]);

        $posts = new Post;
        $posts->title = $request->input('title');
        $posts->brand = $request->input('brand');
        $posts->model = $request->input('model');
        $posts->safety = $request->input('safety');
        $posts->equipment = $request->input('equipment');
        $posts->condition = $request->input('condition');
        $posts->price = $request->input('price');
        $posts->save();

        return 123;
    }

My Post.php model :

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    protected $table = 'posts';

    protected $primaryKey = 'id';
}

I just started my project.