How to data save these stats?

AS you want to get the stats back after saving you would be using the GetAsync part of datastores. As its just points the script is easy.

Add this bit of code after your Points.Value = 0

local PlayerPoints = ds:GetAsync(player.UserId)

if PlayerPoints ~= nil then
    Points.Value = PlayerPoints
end

Its that simple

So first of all you need to turn on studio api services. So instead of using that script, I would recommend using this. So insert a script in ServerScriptService and name it whatever you want, copy and paste this code in it. Every time you add a new stat then, basically make another line under savevalue = plr.leaderstats.Points and type in something like savevalue2 = plr.leaderstats.Cash and dont forget to do savevalue2.Value and at very bottom put a comma after the leaderstats.Points.Value and add plr.leaderstats.Cash.Value. Hope this was helpful.

local DS = game:GetService("DataStoreService"):GetDataStore("Datae") game.Players.PlayerAdded:Connect(function(plr) wait() local plrkey = "id_"..plr.userId local savevalue = plr.leaderstats.Points

local GetSaved = DS:GetAsync(plrkey)
if GetSaved then
    savevalue.Value = GetSaved[1]

else
    local NumbersForSaving = {savevalue.Value}
    DS:GetAsync(plrkey, NumbersForSaving)
end

end)

game.Players.PlayerRemoving:Connect(function(plr) DS:SetAsync("id_"..plr.userId, {plr.leaderstats.Points.Value}) end)

BadGold = script.Parent
isHidden = false 

--Give the player a Points leaderboard when they join the game
game.Players.PlayerAdded:Connect(function(player)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player

    local Points = Instance.new("IntValue")
    Points.Parent = leaderstats
    Points.Name = "Points"
    Points.Value = 0
end)


--Fires a function when the player touches the BadGold
BadGold.Touched:Connect(function(hit)
    --if the BadGold is not hidden and the thing touching the BadGold is a player...
    if(not isHidden and game.Players:FindFirstChild(hit.Parent.Name))then
        --give the player one point and make the brick hidden again
        local player = game.Players[hit.Parent.Name]

        player.leaderstats.Points.Value = player.leaderstats.Points.Value + 1

        BadGold.Transparency = 1
        isHidden = true

        wait(2) -- wait 2 seconds to make the BadGold visible again after being touched

        isHidden = false 
        BadGold.Transparency = 0

    end
end)

the rest of the code is for when i touch a part i get a point. i thought it will help you to know

you set the data. but don't load it in when the player joins the game. and i recommend to put it in a pcall() so it won't stop the whole script if it errors.

local DataStore = game:GetService("DataStoreService")
local ds = DataStore:GetDataStore("CashSaveSystem")

game.Players.PlayerAdded:connect(function(player)
    pcall(function()
        local player.leaderstats.Points.Value = ds:GetAsync(player.UserId, player.leaderstats.Points.Value) or 0
    end
end

game.Players.PlayerRemoving:connect(function(player)
    pcall(function()
        ds:SetAsync(player.UserId, player.leaderstats.Points.Value)
    end
end)

the reason why i put "or 0" is because if the player joins and they don't have any data then we would need to change it to 0. hope this helped!