Use nextcloud on raspberrypi from another network for beginners

Hello there

As a totally beginner in linux I was wondering if anybody could point me in the right direction for getting my nextcloud server available outside the wifi network. I have nextcloud running on a raspberry pi with raspian, apache, mysql, php7 and it works fine on the wifi network. How do I make it available outside the wifi net?

Nextcloud version (eg, 12.0.2): 14
Operating system and version (eg, Ubuntu 17.04):rasbian GNU/Linux 9
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1):7.0.30

The issue you are facing:

from my experience, follow the website from natcho packer @ ownyourbits, there is an sd install package ready to install and brillantly designed :wink:

Does it mean that you are running NC within your private network (192.168.x.x, 10.x.x.x) only?
If no, please explain more your situation.
If yes, what you should look for is network/dns/firewall knowledge. As NC is a web application, what you need to know is the same as setting up an open-to-internet-website on your raspberry pi (which is NC independent). Should not be difficult to google via this direction.