Separate Routes by Files

If you have a set of routes related to a certain "section", you may separate them in a special routes/XXXXX.php file, and just include it in routes/web.php

Example with routes/auth.php in Laravel Breeze by Taylor Otwell himself:

Route::get('/', function () {
    return view('welcome');
});
 
Route::get('/dashboard', function () {
    return view('dashboard');
})->middleware(['auth'])->name('dashboard');
 
require __DIR__.'/auth.php';

Then, in routes/auth.php:

use App\Http\Controllers\Auth\AuthenticatedSessionController;
use App\Http\Controllers\Auth\RegisteredUserController;
// ... more controllers
 
use Illuminate\Support\Facades\Route;
 
Route::get('/register', [RegisteredUserController::class, 'create'])
                ->middleware('guest')
                ->name('register');
 
Route::post('/register', [RegisteredUserController::class, 'store'])
                ->middleware('guest');
 
// ... A dozen more routes

But you should use this include() only when that separate route file has the same settings for prefix/middlewares, otherwise it's better to group them in app/Providers/RouteServiceProvider:

public function boot()
{
    $this->configureRateLimiting();
 
    $this->routes(function () {
        Route::prefix('api')
            ->middleware('api')
            ->namespace($this->namespace)
            ->group(base_path('routes/api.php'));
 
        Route::middleware('web')
            ->namespace($this->namespace)
            ->group(base_path('routes/web.php'));
 
        // ... Your routes file listed next here
    });
}