laravel session flash 2020

$request->session()->put('key','value');

use Illuminate\Support\Facades\Session;

Session::flash('message','This is a message!'); 

then in your view::

@if(Session::has('message'))

<p class="alert
{{ Session::get('alert-class', 'alert-info') }}">{{Session::get('message') }}</p>

@endif

session(['name' => 'data']);