Laravel Authentication broken down

login.php

// install a fresh copy of Laravel 5.7, make:auth and migrate the database 
// head over to yoururl.test/login and hit login button

resources/views/auth/login.blade.php

  11    <form method="POST" action="{{ route('login') }}">
  
  // the named route points to /login for GET and POST

routes/web.php

	Auth::routes();

	vendor/laravel/framework/src/Illuminate/Support/Facades/Auth.php

	  44    public static function routes(array $options = [])
    
    vendor/laravel/framework/src/Illuminate/Routing/Router.php

		1147  public function auth(array $options = [])

		1151	$this->post('login', 'Auth\LoginController@login');

app/Http/Controllers/Auth/LoginController.php

  21    use AuthenticatesUsers;

	vendor/laravel/framework/src/Illuminate/Foundation/Auth/AuthenticatesUsers.php

	  31	public function login(Request $request)
    
            if ($this->attemptLogin($request)) {

	  78	protected function attemptLogin(Request $request)
    
            return $this->guard()->attempt(
                $this->credentials($request), $request->has('remember')
            );
            
    // this->guard is default an instance of the defined guard, see config/auth.php
		vendor/laravel/framework/src/Illuminate/Auth/SessionGuard.php

		 345    public function attempt(array $credentials = [], $remember = false)

	// when the login attempt was ok, return true 

	 102	protected function sendLoginResponse(Request $request)

		 109	?: redirect()->intended($this->redirectPath());

			vendor/laravel/framework/src/Illuminate/Foundation/helpers.php

		 	692	function redirect($to = null, $status = 302, $headers = [], $secure = null)

				vendor/laravel/framework/src/Illuminate/Routing/Redirector.php

		 		107	public function intended($default = '/', $status = 302, $headers = [], $secure = null)

				 	vendor/laravel/framework/src/Illuminate/Foundation/Auth/RedirectsUsers.php

				 	  12    public function redirectPath()

				 	  // if exists calls the method or returns the property otherwise '/home'

	// if something went wrong, return false

	 132	protected function sendFailedLoginResponse(Request $request)

        throw ValidationException::withMessages([
            $this->username() => [trans('auth.failed')],
        ]);

        app/Exceptions/Handler.php

    	  47    public function render($request, Exception $exception)

    	  vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php

    		 168	public function render($request, Exception $e)

	   		 231 	protected function convertValidationExceptionToResponse(ValidationException $e, $request)

	   		 249   protected function invalid($request, ValidationException $exception)

	   		 		url()->previous()

   		 			vendor/laravel/framework/src/Illuminate/Routing/UrlGenerator.php

	   		 		 154   public function previous($fallback = false)