prevent users from unauthorized access of web pages

How can I prevent the users to access my web pages via url browsing. I mean I need to check whether the user is logged in before accessing any web pages. The application should not allow to access the page to user just by url.

Shall I have to check in every controller for authentication or is there any other way?

Suppose I have a controller DistributorController. Now the methods inside this controllers are,

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Session;
use App\Distributor;

class DistributorController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        //
    }

    function fetchData()
    {
        $distributors = Distributor::all()->toArray();
        return compact('distributors');
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('pages.distributors', $this->fetchData());
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        try{
            // code block
        }
        catch (\Exception $e) {
            // code block
        }
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        //
    }
}

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