how i use inner join from controller in my blade php

public function index()
{
    $lesson= DB::table('lessons')
->select('long_text')
->join('courses', 'courses.lesson_id', '=', 'lessons.id')
->where('courses.title', $courses)
->get();

return view(lesson.index);
}

in my blade

  <ul>
    <li style="text-transform: uppercase;">  </li>
</ul>  

when I click on the title to show me the lesson from that course

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