Laravel: Trouble with update db after click button

I have problem: I build an app and I have 2 tables in my db: habits and users. The User has a field called points and after click a button 'Add point' I want to increment that value. I added a method in HabitsController called addPoints and button in a view, but I get an error message: MethodNotAllowedHttpException No message. There is my code.

HabitsController.php

   <?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Habit;
use App\User;
use DB;
use App\Quotation;

class HabitsController extends Controller
{
     /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('auth');
    }

    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
       //store in $habits all posts of current user 
        $habits = DB::table('habits')->where('user_id', auth()->id())->get();

        return view('habits.index')->with('habits', $habits);
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('habits.create');
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $this->validate($request, [
            'name'=>'required',
            'description'=>'required',
            'difficulty'=>'required'
        ]);

        $habit = new Habit;
        $habit->name = $request->input('name');
        $habit->description = $request->input('description');
        $habit->difficulty = $request->input('difficulty');
        $habit->NumberOfCompleted = 0;
        $habit->user_id = auth()->user()->id;
        $habit->save();

        return redirect('/habits')->with('success', 'Habit created');
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        $single = Habit::find($id);
        return view('habits.show')->with('single', $single);
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        $single = Habit::find($id);
        return view('habits.edit')->with('single', $single);
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        $this->validate($request, [
            'name'=>'required',
            'description'=>'required',
            'difficulty'=>'required'
        ]);

        $habit = Habit::find($id);
        $habit->name = $request->input('name');
        $habit->description = $request->input('description');
        $habit->difficulty = $request->input('difficulty');
        $habit->NumberOfCompleted = 0;
        $habit->save();

        return redirect('/habits')->with('success', 'Habit created');
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        $single = Habit::find($id);
        $single->delete();

        return redirect('/habits')->with('success', 'Habit deleted');
    }

    public function addPoint(Request $request, $id)
    {
        $habit = User::find($id);
        $habit->points += 1;
        $habit->save();

        return redirect('/habits')->with('success', 'Habit created');
    }
}

show.blade.php

@extends('layouts/app')

@section('content')
<div class="row single">
    <div class="col-sm-8 col-sm-offset-2 showSingleHabit">
        <h2></h2>
        <p></p>
        <p></p>
        <p></p>
        <a href="/habits//edit" class="btn btn-default">Edit</a>

        {!!Form::open(['action' => ['HabitsController@destroy', $single->id], 'method' => 'POST'])!!}
            
            
        {!!Form::close()!!}

         {!!Form::open(['action' => ['HabitsController@update', $single->id], 'method' => 'POST'])!!}
            
            
        {!!Form::close()!!}
    </div>
</div>
@endsection

routes/web.php

Route::get('/', 'PagesController@index');
Route::get('/about', 'PagesController@about');

Route::resource('habits', 'HabitsController');
Auth::routes();

Route::get('/dashboard', 'DashboardController@index');

I will be grateful for any help. :)

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