Hello!
I have installed NextCloud via NCPI on my pi 4. I bought a .dev domain at google domains. It needs a ssl-certificate in order to work. if i want to forward my domain to my ip (dyndns), I still need a SSL certificate?! due to secured namespace .dev tld needs https. how can i actually install this for my server when it runs nextcloud? i’ll probably use let’s encrypt (i don’t want to spend big bucks on this).
Hey @elvinceffm,
welcome here on the forums!
Using letsencrypt is in my opinion quite easy with certbot. Best have a look onto certbots page for your specific server and os. The instructions there are quite easy to follow, i think.
And in my opinion, to have a clean setup, use certbot with certonlycommand and configure your server manually with mozilla ssl configurator, just like stated on nextcloud’s administration docs. 
EDIT: Seems like i was a bit too fast, sorry. I actually never used the ncpi image. But just having a look into their docs, there are instructions for certbot, too!
https://docs.nextcloudpi.com/en/how-to-get-certificate-with-letsencrypt-using-dns-to-verify-domain/
Greets!
Jonas
https://docs.nextcloud.com/server/20/admin_manual/installation/harden_server.html#use-https
The solution is to use the NextCloudPi Panel: Go to letsencrypt, put whatever domain points to your ip there and your email, certbot will handle anything
I didn’t know much about SSL and certificates but using certbot is in fact very easy.