Likely not the solution you're looking for but a buddy and i link a folder via syncthing and anything added to one side shows up on the other.

https://github.com/florisboard/florisboard/discussions/2314#discussion-5761611

According to this it's still planned, though time will tell.

Learning how to use your pi to run a reverse proxy to a self hosted blogging site would give you plenty of hands on starter experience. Run docker and portainer and mess with docker config files from a webgui to see what work and what doesn't.

I'm never a fan of virtualizing network related items for the sake of redundancy, if your server goes down the rest of your network can keep doing it's thing. That being said, with the hardware you have on your hands i don't see any solid atonemen argument for bringing in more hardware.

Proxmox is a great base for you to really ramp things up and i'd recommend looking into pfsense as a routing/firewall solution. There's a bunch of great youtube videos that can talk you through setting it up and using it as your vpn point, adblocking, reverse proxy, and so much more.

I'm no expert but my understanding is all drinking cans are lined with plastic to withstand erosion.

https://www.ehow.com/facts_7390219_metal-cans-lined-plastic-coating_.html

Headscale is a self hosted version of tailscale, if you'd like to keep it as an option

Whoogle. It's treated me well enough so far.

Beating google while being local would be the dream, wouldn't it? What you say tracks but i'm like you, i've not done anything remotely like it so it's very possible we're underestimate indeed.

Agreed there isn't any beating google, but everyone operates on different threat models. A bit of inconvenience for a bit of privacy may be worth it for some and not for others. From what little i used of it when i was trying it that yes it had much room for improvement but it was still useable. Once they get predictive text enabled i think the a swipe feature will really shine. But then again that's just my humble opinion

Ah, my apologies, i didn't know it was only limited to english

FlorisBoard has swipe

It does sound very similar but you are correct, too new of a game to be the one i'm trying to remember