product categories

Hey! I am creating an ecommerce website in Laravel and my categories are not displaying correctly. There's just the list of the categories and when clicking on one of them, the url is changing depending on the slug but that's all, it is still displaying just the list.

Category Controller

<?php

namespace App\Http\Controllers;

use App\Models\Product;
use App\Models\Category;
use Illuminate\Http\Request;

class CategoryController extends Controller
{
    public function createCategory(Request $request)
    {
        $categories = Category::where('parent_id', null)->orderby('name', 'asc')->get();
        if($request->method()=='GET')
        {
            return view('create-category', compact('categories'));
        }
        if($request->method()=='POST')
        {
            $validator = $request->validate([
                'name'      => 'required',
                'slug'      => 'required|unique:categories',
                'parent_id' => 'nullable|numeric'
            ]);

            Category::create([
                'name' => $request->name,
                'slug' => $request->slug,
                'parent_id' =>$request->parent_id
            ]);

            return redirect()->back()->with('success', 'Category has been created successfully.');
        }
    }
    public function input($slug) {
        $categories=Category::all();
        $category=Category::where($slug=$this->slug)->first();
    	$category_id=$category->id;
    	$category_name=$category->name;
$products=Product::where('category_id',$category_id);  
return view('categories',
['categories' => $categories, 'products'=>$products]); 
    }
    public $slug;
    public $categories;
}

Category.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Category extends Model
{
    use HasFactory;
    protected $fillable = ['name', 'slug', 'parent_id'];

    public function subcategory()
    {
        return $this->hasMany(\App\Models\Category::class, 'parent_id');
    }

    public function parent()
    {
        return $this->belongsTo(\App\Models\Category::class, 'parent_id');
    }

}

web.php

Route::any('category/create', [CategoryController::class, 'createCategory'])->name('createCategory');
Route::get('/categories/{slug}',  [CategoryController::class, 'input'])->name('inputCategory');

categories.blade.php

@foreach($categories as $category)
 <li><a href="{{ route('inputCategory',['slug'=>$category->slug])}}">{{ $category->name }}</a></li>
 
@endforeach 

categories table contains id, name, slug, parent_id products table contains id, category_id, name, price, description, image