How to make a constantly looping script? How to make one fire when someone joins the server?

How would one make a script that constantly loops? How about making a script that runs specific to any player that just joins the server?

To make a constant loop you'd use "while true do", like this -

while true do
wait(.1)
--do thing here
end

Remember to put a wait! If you don't, when you run the script it will run the script infinitely fast an infinite amount of times, which will crash your client!

To make a script that fires for a certain player, you would do -

game.Players.PlayerAdded:connect(function(player)

"player" represents the player who joined, so for example if I want to make a bool value specific to a player (for example for an inventory system) I would do -

game.Players.PlayerAdded:connect(function(player)
local bool = Instance.new("BoolValue")
bool.Name = "ExampleBool"
bool.Parent = player

This would make a bool that is inside the player, and would do that for everyone who joins the game.

Tell me if you need anything else.