Nextcloud website not up after fresh install (Ubuntu 18.04 Server)

I used the link below to create my nextcloud server, but when opening the page in my browser to access Nextcloud for the first time, I only get the apache start page.

Please help!

https://websiteforstudents.com/setup-nextcloud-on-ubuntu-18-04-lts-beta-with-apache2-mariadb-and-php-7-1-support/

In the above description a2enmod php7.1 is missing.
And after that of course sudo systemctl restart`apache2.service