Exposing services over the public internet is not without risks, you might consider getting more knowledge before doing it

Every service you expose should require authentication and may need to handle bots

To gain knowledge about reverse proxies and dns without much risk exposure, you could start by setting up your custom domain name on your private tailscale network, here is an example of how you could do it

Now if you really want to expose services on the internet because you have devices that you don’t want to connect to your tailscale network, you could use tailscale funnel, but only with your ts.net custom subdomain that they provide you, not with your own domain

There is an open issue to support custom domains https://github.com/tailscale/tailscale/issues/11563

I’m waiting for this to get resolved, in the meantime I have a vps with a reverse proxy connected to a tailscale container, that serves my services from my home network, so that I dont need a static IP or open a port in my home router

Cryptpad has a rich text editor that could meet your needs, files can be shared with a readonly link

As a TV centric distro, there is libreelec https://libreelec.tv/ You can use it to stream media from jellyfin, plex or other streaming platforms with plugins

It runs kodi that you can also use in other distros as a package

Kodi supports hdmi-cec, which allows to use your TV remote to control kodi, the hardware needs to be compatible too though (raspberry pis are compatible) There is also a mobile app, Kore, to control kodi on local network

The UX may not be as slick as androidtv/appletv but it is customizable