php - Call to a member function error in Laravel

I'm building a blog on Laravel 7 and when I try to create a post I get this error:

Call to a member function categories() on bool
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Here is my store method from my controller:

public function store(Request $request)
    {
        // Validate incoming data
        $this->validate($request, [
            'title' => 'required',
            'image' => 'required',
            'categories' => 'required',
            'body' => 'required',
        ]);

        $data = array();
        $data['title'] = $request->title;
        $data['slug'] = str_slug($request->title);
        $data['user_id'] = Auth::id();
        $data['meta_title'] = $request->meta_title;
        $data['meta_description'] = $request->meta_description;
        $image = $request->file('image');
        $data['body'] = $request->body;
        $data['created_at'] = \Carbon\Carbon::now();

        $slug = str_slug($request->title);
        
        if($image) {
            $image_name = $slug . "-" . date('dmy_H_s_i');
            $ext = strtolower($image->getClientOriginalExtension());
            $image_full_name = $image_name . '.' . $ext;

            $upload_path = "public/assets/frontend/uploads/posts/";
            $image_url = $upload_path . $image_full_name;
            $success = $image->move($upload_path, $image_full_name);

            $data['image'] = $image_url;
            $post = DB::table('posts')->insert($data);
            

            $post->categories()->attach($request->categories);
            return redirect(route('admin.posts.index'))->with('successMsg', 'Post has been saved successfully!');
        }
}
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The laravel error page has a problem with this line:

$post->categories()->attach($request->categories);
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I have a separate table in my database to connect a post id with a category id, it's called category_post The post content is inserted into the database except the new record in the category_post table

So how do I change that code to work? Thanks

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