Leaderstats

game.Players.PlayerAdded:Coonect(function(plr) -- You can also do Player here, but plr is shorter for that

local leaderstats = Instance.new("Folder")
leaderstats.name = "leaderstats"
leaderstats.Parent = plr -- You can also do the parent as plr at ("Folder", plr)

local cash = Instance.new("IntValue")
cash.Name = "cash"
cash.Parent = leaderstats -- As before, you can also do it at ("IntValue", leaderstats)
cash.Value = 100 -- This is how much money the player will start with
end)