Logic

// in routes/web.php
Route::get('/post/create', [App\Http\Controllers\PostController::class, 'create']);
Route::post('/post', [App\Http\Controllers\PostController::class, 'store']);
// in app/Http/Controllers/PostController...
public function store(Request $request)
{
    $validated = $request->validate([
        // input name => validation rules
        'title' => 'required|unique:posts|max:255',
        'body' => 'required',
    ]);
    // The blog post is valid...
}