some progress

app/Models/Genre.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Genre extends Model
+{
+    public const TYPE_MOVIE = 'movie';
+    public const TYPE_SHOW = 'show';
+
+    protected $fillable = [
+        'name',
+        'slug',
+        'tmdb_id',
+        'type',
+    ];
+
+    public function movies() {
+        return $this->belongsToMany(Movie::class, 'movie_genres', 'genre_id', 'movie_id');
+    }
+}