Info and filtering by course tracks, table of content on chapter view with links and previous and next buttons.

app/Http/Controllers/Index.php

@@ -9,9 +9,9 @@ use Illuminate\Http\Request;
 
 class Index extends Controller
 {
-    public function index()
+    public function index(string $track = null)
     {
-        $courses = Course::with('chapters')->withCount('chapters')->get();
+        $courses = Course::where('tracks', 'like', '%'.$track.'%')->with('chapters')->withCount('chapters')->get();
 
         return view('index', compact(['courses']));
     }