> Actually, I didn't configure it on any port. I was following a guide
> in
> https://www.linuxcapable.com/how-to-install-nginx-with-lets-encrypt-tl
> s-ssl-on-debian-11-bullseye. However I can't get brotli to be accepted
> in /etc/nginx/nginx.conf (as specified in the guide) and nginx you say
> I have it looking at port 80, but (a) I don't [at least not by my
> direction] and the guide does not specify anything regarding that.
> Clearly the guide is wrong and I will have to find another way to
> approach this.
>
> Thank you for your clear comments. It is I who is over my head.

Just to say about Brotli and your instruction. Brotli is not implemented in Nginx pckg in default repo AFAIK and you need to configure it yourself from scratch.
But in your instruction there's two diff ways of installing Nginx and the second one says:
"You will notice additional modules will be available in this version, most notably brotli support."
That means in 3rd-party repos there's a Nginx build which already have brotli compiled in.