How would you make a script loop? [closed]

If you want an unconditional infinite loop, while true do .. end is actually the way to go.

Inside, you can use the wait method of Events to avoid having to utilize busy waits, for increased efficiency:

while true do
    script.Parent.Touched:wait() --lowercase 'w' ":Wait()" will error
    print("script.Parent was Touched!")
end

If you ever run into a case of having to use some kind of busy wait:

while not script:FindFirstChild("LocalManager") do
    wait()
end

Try and script to avoid that:

while not script:FindFirstChild("LocalManager") do
    script.ChildAdded:wait()
end

And if you can't figure out how to do that, by all means ask here.

(In this case, you could just use WaitForChild, but this is the best example of this I could think of right now. I'd actually be surprised if this wasn't the code for WaitForChild internally.)

while wait() do
print("Hi")
end

This will print "Hi" endlessly.