Auth or Guest or both, middleware.

Route groups:

Route::group(['middleware' => ['auth']], function () {
    // routes that require user to be authenticated
});

You might also see the middleware applied as a method (same result, different syntax):

Route::middleware(['auth'])->group(function () {
    // routes that require user to be authenticated
});

Okay so groups are a way to go.

Thank you!

I'd really suggest giving the docs a thorough reading through: https://laravel.com/docs/5.7/routing

You're only going to learn a certain % of the capabilities by watching the videos, which are a great supplement to the actual docs.

Exactly. You can define routes for both guest and non-authenticated users outside that group; or indeed have a route group for guests only (e.g. register, login):

Route::middleware(['guest'])->group(function () {
    // routes that require user to be authenticated
});

when we use auth and guest , or they are the same ?