mostly present in fairytales these days

It’s also the currency in the german language donald duck comics.

Not when the critical infrastructure is the infrastructure for storing and moving those materials.
Also people tend to settle where trade happens and work is available.

You are supposed to run sudoedit.
This command creates a temporary copy, opens it in you editor of choice and overwrites the protected file when the temp file changes.
That way the editor doesn’t run as root.
You can see the difference if you run shell command, like whoami, in vim.

I’m wondering if there’s a way [to] combine their computational power.

Only if your problem can be be split up reasonably, otherwise you will spend more time waiting for data to move.
Where it can work: video encoding, CI pipelines, data analysis
Where it won’t work: interactive stuff, most single file operations

I want to get into server hosting […]

Then you don’t need another reason to do it.

[If] I can connect them all to one display [or] make them all accessible in one place.

You can either get a hardware switch or chose a primary computer and connect to the others. For that you can use remote desktop software or be a try hard and use ssh.

And how many Palestinian children are in ‘dire’ conditions?