I'm starting in laravel but I get the error Could not open input file:
I'm in windows, I tried it as administrator, in xampp, but the error continues, in both cases within the laravel folder and nothing.
You have different ways of creating a new project ...
I recommend one: via composer, on its official website you can download the installer for windows ( link )
Then you can run:
composer create-project --prefer-dist laravel/laravel blog
and the command you were trying to make last, to serve the application in link
php artisan serve
The official documentation with more details: link
If these commands fail you or you have some other problem, I encourage you to ask again. Good luck.