mead-blog/app/Observers/CourseBookObserver.php

<?php

namespace App\Observers;

use App\Models\CourseBook;

// creating, created, updating, updated, saving,
// saved,  deleting, deleted, restoring, restored

class CourseBookObserver
{
    public function creating(CourseBook $course_book)
    {
        //
    }

    public function updating(CourseBook $course_book)
    {
        //
    }
}