To add a simple route to a laravel project I will show you two options:

example.com/post

1. Laravel Blade:

web.php

Route::get('/post', function () {
    return view('post');
});

resources/views/post.blade.php

<h1>This is post.blade.php</h1>

2. Laravel Inertia (React):

web.php (with login authentication)

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

resources/js/Pages/Post.jsx

import React from 'react';
function Post () {

  return (
    <div>
      <h1>Post Component</h1>
    </div>
  )
}

export default Post