How Do I Connect My Laravel Project[views] file to Route Auto Created with Jetstream?

I am actually following up on a Laravel course that uses Blade component template and the tutor coded the Login/Register/Dashboard, etc individually. I couldn't keep up with the coding and I sorted for a quicker way of adding those features.

That was how I discovered I can do those things with Jetstream. I installed Jetstream/Livewire and the above mentioned features were added automatically with a default view/welcome.blade.php connected to Route/web.php.

Now here is my problem. Because I still want to follow through with the course by using Blade template method, I deleted the defaulted welcome.blade.php(as the tutor did too), created two folders with a file respectively: Layouts/app.blade.php and Posts/index.blade.php. On the Route/web.php, I changed the default welcome to post.index but it is not working. Here is the code on my Route:

Route::get('/post', function () {
    return Inertia::render('post.index', [
        'canLogin' => Route::has('login'),
        'canRegister' => Route::has('register'),
        'laravelVersion' => Application::VERSION,
        'phpVersion' => PHP_VERSION,
    ]);
});

Route::middleware(['auth:sanctum', 'verified'])->get('/dashboard', function () {
    return Inertia::render('Dashboard');
})->name('dashboard');

And here is the error I got:

InvalidArgumentException View [app] not found. http://127.0.0.1:8000/post

app was not found. Are you sure the view exists and is a .blade.php file?

This is the screenshot of my editor to show the code and prove I have the view files.

Edited Here are the index.blade.php and app.blade.php as requested by @Prospero:

source https://stackoverflow.com/questions/69776598/how-do-i-connect-my-laravel-projectviews-file-to-route-auto-created-with-jetst