Auto save leaderbored

ds = game:GetService("DataStoreService"):GetDataStore("Points") -- GetDataStore provides a key to save everything under.  Can be anything.

game.Players.PlayerAdded:connect(function(player)
    local leaderstats = Instance.new("IntValue",player) -- Creating the leaderboard
    leaderstats.Name = "leaderstats"
    local points = Instance.new("IntValue",player)
    points.Name = "Points"
    points.Value = ds:GetAsync(player.Name) or 0 -- Here we look for the players name under "Points".  DataStores act like a table, and if the players name doesn't yet exist, it sets the points to 0 by default.
end)

game.Players.PlayerRemoving:connect(function(player)
    ds:UpdateAsync(pplayer.Name, function(oldValue) return p.leaderstats.Points.Value end) -- This can be confusing.  The first argument, p.Name, is the name of the key inside the Points DataStore.  The value you update it with has to be a function, so function(oldValue) return value end is the recommended way to go.  The argument of the function is what the value used to be
end)

game.OnClose = function() -- This part is recommended to ensure the game saves when the last player leaves the server before it shuts down!
    for i,v in pairs(game.Players:GetChildren()) do
        ds:UpdateAsync(v.Name, function(oldValue) return v.leaderstats.Points.Value end)
    end
    wait(1)
end)