laravel/app/Http/Controllers/POSTCONTROLLER.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class POSTCONTROLLER extends Controller
{
    public function send(Request $request) {
        $validatedData = $request->validate([
            'email' => 'required|email',
            'firstName' => 'required',
            'lastName' => 'required',
            'address' => 'required',
            'country' => 'required',
            'state' => 'required'
        ]);

        $user = new \App\User;
        $user->lastName = $request->lastName;
        $user->firstName = $request->firstName;
        $user->address = $request->address;
        $user->country = $request->country;
        $user->state = $request->state;
        $user->email = $request->email;
        $user->save();
        session()->flash('success', "Вы успешно зарегистрировались!");
        return view('success');
    }
  
}