Letsencrypt setup for nextcloud

I was following chbmb the guide to setup Nextcloud with Letsencrypt reverse proxy.

I currently have a working nextcloud instance, but I fail to understand how to proceed!

I have a duckdns free domaine name, but Im unsure what to do next ? a video on youtube talk about port foward but I have no clue how to do that on a asus router (ac3200 ), and after hours of guide watching, here I am!

See here: https://blog.linuxserver.io/2019/04/25/letsencrypt-nginx-starter-guide/
and here: https://blog.linuxserver.io/2019/07/10/troubleshooting-letsencrypt-image-port-mapping-and-forwarding/

mhm I think ill give up! make me feel super dumb reading those pages!

is there other way to upload file onto unraid other then nextcloud ?

What exactly is your usecase? The manual for your router should have this information. You can find them online usually.

Check this link