laravel 5.7 how to pass request of controller to model and save

I am new in laravel and I am trying to pass $request from a function in controller to a function in model.

THis is my controller function:

PostController.php

public function update(PostUpdateRequest $request, post $post)
{

    $post->title = $request->title;
    $post->description = $request->description;

    $post->save();

    return redirect(route('post.index'));

}

how save data in model ?

Thanks

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