How to add css in laravel manually?

I'm trying to add my css in laravel manually without using command. I save my folder css to public and use this code

{!! Html::style( asset('css/bootstrap.min.css')) !!}
{!! Html::style( asset('css/style.css')) !!}

but still doesn't work. I read tutorials about this but they teach to cammand it. Do I have something to configure about this? I'm new in laravel. Trying to learn it. hoping for your help. thanks in advance

via Chebli Mohamed