"Script that stores data and loads it when the player joins the game"

-- server script 
local DataStoreService = game:GetService("DataStoreService")
local playerDataStore = DataStoreService:GetDataStore("PlayerData")

function saveData(player)
    local key = "Player_"..player.UserId
    local data = {
        coins = player.leaderstats.Coins.Value,
        bag = player.leaderstats.Bag.Value
    }
    playerDataStore:SetAsync(key, data)
end

function loadData(player)
    local key = "Player_"..player.UserId
    local success, data = pcall(function()
        return playerDataStore:GetAsync(key)
    end)
    if success and data then
        player.leaderstats.Coins.Value = data.coins
        player.leaderstats.Bag.Value = data.bag
    end
end

game.Players.PlayerAdded:Connect(function(player)
    loadData(player)
    player.CharacterAdded:Connect(function(character)
        character:WaitForChild("Humanoid").Died:Connect(function()
            saveData(player)
        end)
    end)
end)

game.Players.PlayerRemoving:Connect(function(player)
    saveData(player)
end)