Your local network does not seem to have hairpinning enabled. what does that mean?

[tituspijean]

@arkdech

And I’ve been on several forums where people(including myself) were asking questions because they didn’t have another option.

This is the official support forum for YunoHost. Welcome again!

@arkdech

Anyways, I ran the diagnostic in the user interface and it showed UPNP disabled and when I click to enable i get the error message about port 1900 being closed. When I attempt to open port 1900 it tell me that it is already closed.

You failed to disclose which app you installed, but no worries I found out: Jellyfin. You can safely Ignore the warning, it is a slight bug with YunoHost which does not discriminate between ports opened on TCP or UDP. (Same issue with WireGuard here).

@arkdech

All in all it is an easy setup until the part where the program lets go of your hand and you have to configure port forwarding and ddns and all that.

Yup, these actions have to be done manually, because they are out of the reach of the software (it is like asking your car to repave a road, that is not its job).
Regarding dynamic dns, the documentation is helpful I think. Regarding standard DNS; we will soon be able to configure them with some registrars programmatically.