Route::post('/adlogin', 'mainController@adminlogin');
Route::get('/sellerlogin', function () {
    return view('seller.pages.login');
});

Route::post('/sellerlog_in', 'mainController@sellerlogin');

<?php

namespace AppHttpControllersAuth;

use IlluminateHttpRequest;
use AppHttpControllersController;

//Use Dependencies
use Auth;

class AdminLoginController extends Controller
{

public function __construct()
{
    $this->middleware('guest:admin', ['except'=>'logout']);
}

public function showLoginForm()
{
    return view('auth.admin_login');
}

public function login(Request $request)
{
    //Validate the Form Data
    $this->validate($request, [
        'email'=>'required|email',
        'password'=>'required|min:5'
    ]);

    //Attempt to log the Admin In
    $email= $request->email;
    $password= $request->password;
    $remember= $request->remember;

//If Successful redirect to intended location
    if (Auth::guard('admin')->attempt(['email' => $email, 'password' => $password], $remember)) {
        return redirect()->intended(route('admin.dashboard'));
    }

    //If Unsuccessful redirect back to login form with form data
    return redirect()->back()->withInput($request->only('email', 'remember'));
}

/**
 * Log the Admin out of the application.
 *
 * @param  IlluminateHttpRequest  $request
 * @return IlluminateHttpResponse
 */
public function logout()
{
    Auth::guard('admin')->logout();

    return redirect()->route('admin.login');
}
}

'guards' => [
        'web' => [
            'driver' => 'session',
            'provider' => 'users',
        ],
    'api' => [
        'driver' => 'token',
        'provider' => 'users',
    ],
    'admin' => [
        'driver' => 'session',
        'provider' => 'admins',
    ],

    'admin-api' => [
        'driver' => 'token',
        'provider' => 'admins',
    ],
],

'providers' => [
        'users' => [
            'driver' => 'eloquent',
            'model' => AppUser::class,
        ],
        'admins' => [
            'driver' => 'eloquent',
            'model' => AppAdmin::class,
        ],
],

'passwords' => [
        'users' => [
            'provider' => 'users',
            'table' => 'password_resets',
            'expire' => 60,
        ],
        'admins' => [
            'provider' => 'admins',
            'table' => 'password_resets',
            'expire' => 10,
        ],
    ],

//Check for admin login guard
        switch ($guard) {
            case 'admin':
                if (Auth::guard($guard)->check()) {
                    return redirect()->route('admin.dashboard');
                }
                break;

            default:
                if (Auth::guard($guard)->check()) {
                    return redirect('/dashboard');
                }
                break;
        }