Personal variable

[metatablecatmaid (metatablecat)]

What I assume you want is to tie a value to a player.

You should use ValueBases for this, namely IntValue or NumberValue, you should then parent it to the player so that you can automatically tie it to the player

If you name a Folder or Model ‘leaderstats’ then parent it to a player, it will appear in the leaderboard

local Players = game:GetService("Players")

local function PlayerAdded(plr)
  local leaderstats = Instance.new("Folder")
  leaderstats.Name = "leaderstats"
  
  local money = Instance.new("NumberValue")
  money.Name = "Money"
  money.Value = 0
  money.Parent = leaderstats  

  leaderstats.Parent = plr
end)

Players.PlayerAdded:Connect(PlayerAdded)

Since this is binding an event, you’d preferably want this in a regular old script.
But now, (as long as you do it on the server), you have created a Money value that can be easily changed by doing

Players.(player name).leaderstats.Money.Value = (value)

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TLDR @scripting1st: PSA: Don't use Instance.new() with parent argument

@scripting1st

_G is a global variables, modules can be used, but if you are trying to make a custom variable, oop (Object Oriented Programming) is the way to go.

if you are looking for a way to do this and show it, here you go

game.Players.PlayerAdded:Connect(function(player)
local leaderstats = Instance.new("Folder", player); leaderstats.Name = "leaderstats"

local cash = Instance.new("IntValue", leaderstats); cash.Name = "cash"

end