Back-end PHP framework Laravel learning to trample various pits

"Whoops, looks like something went wrong" appears after installing Laravel's Ventor directory. Such an error message

Open config/app.php, turn debug to True

No supported Encrypter found. The cipher and/or key length is invalid.

Use command in terminal PHP artisan key:generate

Terminal error says no this file

But we found a similar. env.example file that copies a copy of the

The success interface appears

Back-end PHP framework Laravel learning to trample various pits