public function up()
    {
        Schema::create('admin', function (Blueprint $table) {
            $table->id('id');
            $table->string('name');
            $table->string('email');
            $table->string('password');
        });
    }

Route::get('login', 'AuthController@login')->name('admin.login');
Route::post('login', 'AuthController@loginPost')->name('admin.login.post');

public function loginPost(Request $request)
    {
        //dd($request->post());
        if (Auth::attempt(['email' => $request->email, 'password' => $request->password])) {
            return 'Bilgiler Doğru';
            die();
        }
        return 'Bilgiler Yanlış';
    }

<form class="card card-md" action="{{ route('admin.login.post') }}" method="POST" autocomplete="off">
                @csrf
                <div class="card-body">
                    <h2 class="card-title text-center mb-4">Yönetim Paneli</h2>
                    <div class="mb-3">
                        <label class="form-label">E-Posta</label>
                        <input type="email" name="email" class="form-control" placeholder="E-Posta Adresiniz">
                    </div>
                    <div class="mb-2">
                        <label class="form-label">Şifre</label>
                        <div class="input-group input-group-flat">
                            <input type="password" id="password" name="password" class="form-control" placeholder="Şifreniz" autocomplete="off">
                            <span class="input-group-text">
                                <a href="javascript:void(0);" onclick="showPw()" class="link-secondary" title="Şifreyi Göster"
                                    data-bs-toggle="tooltip">
                                    <svg xmlns="http://www.w3.org/2000/svg" class="icon" width="24" height="24"
                                        viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none"
                                        stroke-linecap="round" stroke-linejoin="round">
                                        <path stroke="none" d="M0 0h24v24H0z" fill="none" />
                                        <circle cx="12" cy="12" r="2" />
                                        <path
                                            d="M22 12c-2.667 4.667 -6 7 -10 7s-7.333 -2.333 -10 -7c2.667 -4.667 6 -7 10 -7s7.333 2.333 10 7" />
                                    </svg>
                                </a>
                            </span>
                        </div>
                    </div>
                    <div class="form-footer">
                        <button type="submit" class="btn btn-primary w-100">Giriş Yap</button>
                    </div>
                </div>
            </form>