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Hello, Thank's for sharing sudiptpa  and now i want to rewrite article. If you want custom login with username in laravel 5.8 you can follow this article

1. Create new migration.

$ php artisan make:migration add_username_to_users --table=users

2. add Field username migration to table users.

$table->string('username')->unique();

3. Execute migration and check table user for make sure field.

4. Custom LoginController 

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Http\Request;

class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
     */

    use AuthenticatesUsers;

    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = '/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }

    /**
     * Get the needed authorization credentials from the request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    protected function credentials(Request $request)
    {
        $field = $this->field($request);

        return [
            $field => $request->get($this->username()),
            'password' => $request->get('password'),
        ];
    }

    /**
     * Determine if the request field is email or username.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return string
     */
    public function field(Request $request)
    {
        $email = $this->username();

        return filter_var($request->get($email), FILTER_VALIDATE_EMAIL) ? $email : 'username';
    }

    /**
     * Validate the user login request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return void
     */
    protected function validateLogin(Request $request)
    {
        $field = $this->field($request);

        $messages = ["{$this->username()}.exists" => 'The account you are trying to login is not registered or it has been disabled.'];

        $this->validate($request, [
            $this->username() => "required|exists:users,{$field}",
            'password' => 'required',
        ], $messages);
    }
}

4. Add username from model User

protected $fillable = [
        'name', 'email', 'password', 'username'
    ];

5. Edit route 

<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    return view('welcome');
});

Auth::routes(['verify' => true]);

Route::get('/home', 'HomeController@index')->name('home')->middleware('verified');

6. Edit login.php 

@extends('layouts.app')

@section('content')

@endsection

7. Test login with username for make sure.

Refrence : Github