Fresh installation: http 500 error & php artisan doesn't work

Did you try to run composer install again?

You get a 500 error so you the application is running. You should see an error in your storage/logs/laravel-{date}.log file. You should find a glue there.

Most of the time on setting up a project the application key is missing, but as you said, you can't run php artisan so, something is wrong with the composer dependencies.

yes I did. This is the output, so looks fine to me: https://i.ibb.co/QM7xjK8/lar.png

In the storage/logs directory there is only a .gitignore file, nothing else :/

And yeah, you'r right, the key in the .env file is not filled, but when i enter php artisan key:generate nothing happens: https://i.ibb.co/FwmtVpt/Unbenannt.png

new info: I enabled error_logging in php, and it says, that he couldn't find the vendor/autoload.php file and its right. in the vendor directory isn't a autoload.php file... any hints?

Install should generate the file. Try manually using composer dump-autoload

thanks mate @sinnbeck that was it!