Added helper file, replaced size file for human version as a helper method, next prev buttons for chapters.

resources/views/chapter/index.blade.php

@@ -1,14 +1,26 @@
 <x-layout>
     <h1>
-        {{ $chapter->course->name }}
+        <a href="/">List</a> &raquo; <a
+            href="{{ route('course.index', ['course' => $chapter->course_id]) }}">{{ $chapter->course->name }}</a>
         <br>
         <small class="text-muted">{{ $chapter->title }}</small>
     </h1>
     <div>
+        <div class="float-none">
+            @if($prev)
+                <div class="float-start m-2"><a href="{{ route('course.chapter', ['chapter' => $prev->id]) }}">Prev</a>
+                </div>
+            @endif
+            @if($next)
+                <div class="float-end m-2"><a href="{{ route('course.chapter', ['chapter' => $next->id]) }}">Next</a>
+                </div>
+            @endif
+        </div>
+
         <div class="mx-auto" style="width: 500px;">
             @if($chapter->is_video_file)
                 <video class="mx-auto" width="500" controls>
-                    <source src="/{{ $chapter->video_path }}" type="video/mp4"/>
+                    <source src="{{ $chapter->video_url }}" type="video/mp4"/>
                 </video>
             @endif
         </div>