Doctor conntrollr

 $user_id = User::insertGetId([
            'role_id' => 2,
            'name' => $request->name,
            'username' => $request->username,
            'email' => $request->email,
            'password' => Hash::make($request->password),
            'phn_number' => $request->phn_number,
            'created_at' => Carbon::now()
        ]);
        if ($request->has('bmdc_cer')){
            $bmdc_cer = $request->file('bmdc_cer')->store('doctor','public');
        }
        if ($request->has('nid_pic')){
            $nid_pic = $request->file('nid_pic')->store('doctor','public');
        }

        Doctor::create([
            'user_id' => $user_id,
            'nid_pic' => $nid_pic,
            'bmdc_cer' => $bmdc_cer,
            'bmdc_reg_no' => $request->bmdc_reg_no,
            'area_name_id' => $request->area_name_id
        ]);

        if (Auth::attempt(['email' => $request->email, 'password' => $request->password]))
        {
          return redirect('/login');
        }

        return "Wel Done Mr Doctor"; // error message
    }

Doctor.php

public function Area()
    {
        return $this->belongsTo('App\Area', 'area_name_id','id');
    }

doctor_migration_file

 public function up()
    {
        Schema::create('doctors', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->integer('user_id');
            $table->string('present_address')->nullable();
            $table->string('bmdc_reg_no')->nullable();
            $table->longText('work_exp')->nullable();
            $table->string('edu_degree')->nullable();
            $table->longText('about_me')->nullable();
            $table->string('bmdc_cer')->nullable();
            $table->string('nid_pic')->nullable();
            $table->integer('status')->default(1);
            $table->integer('area_name_id')->nullable();
            $table->integer('category_name_id')->nullable();
            $table->timestamps();
        });
    }

signup_blade.

<!-- Area start -->
                                <div class="form-group form-focus">
                                    <label class="focus-label">Select Your Area</label>
                                    <select name="area_name_id" class="form-control select">
                                        @php($areas= \App\Area::all())
                                        @foreach ($areas as $area)
                                            <option {{ $area->id }}>{{$area->area_name}}</option>
                                        @endforeach
                                    </select>
                                </div>
<!-- Area END -->