shareit/app/Http/Controllers/ProductController.php

<?php

namespace App\Http\Controllers;

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

class ProductController extends Controller
{
    //
    public function index()
    {
        //$product = Product::all();
        return view('product');
    }

    public function show($id)
    {
        //$productID = Product::find($id);
        $productID = $id;
        return view('product', compact('productID'));
    }
}