I am new at PHP , I am not able to connect my form with database . NotFoundHttpException in RouteCollection.php line 179:

**Please Help me with my form connection to database, table is created in database but i am confused how to connect it with my form **

This is my how i am routing my form

      <div id="register" class="animate form">
                        <form action="{{route('signup')}}" method="post" autocomplete="on"> 
                            <h1> Sign up </h1> 
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this is my controller

public function postSignup(Request $request)
    {
        $username = $request['username'];
        $email = $request['email'];
        $password = bcrypt($request['password']);


        $user = new User();
        $user->username = $username;
        $user->email = $email;
        $user->password = $password;


        $user->save();
        return redirect()->back();

    }
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and here comes my route file :

Route::post('/signup',[
    'uses' => [email protected],
    'as'=> 'signup'

    ]);
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error screenshot