How do universes work?

After reading the Roblox Wiki for a while, and looking at the examples they provided in the Wiki, I still couldn't understand a couple of things. This might not be the best place to ask about universe but the forums are full of annoying trolls -_- A. Do universes require a script? (I'm not asking that you give me the script) B. Is there a way to teleport a player from one place to another with their inventory still with them? C. Is this a script that can be used on universes (I found this script while watching a video on universes)

function onTouched(hit) character = hit.Parent print "Teleporting..." if character then game:GetService("TeleportService"):TeleportToSpawnByName(Insert ID Here, "SpawnLocation", character) end end

script.Parent.Touched:connect(onTouched)

<Thx in advance>