How to make a Data store for MaxHealth/Health?

local HealthData = game:GetService("DataStoreService"):GetDataStore("PlayerHealthData")
local DataKey = "~~" -- ..UserId


-- Load The Health
function loadHealth(Character)
	local Humanoid = Character:WaitForChild("Humanoid")
	local PlayerHealthData = HealthData:GetAsync(DataKey..player.UserId) -- Players Data In The Data Store
	if PlayerHealthData then -- Checks If Player Has Data
		Humanoid.MaxHealth = PlayerHealthData[1]  -- Sets Max Health To Stored Health Value In The DataStore
		Humanoid.Health = Humanoid.MaxHealth -- Sets same as MaxHealth
	else -- If Player Does Not Have Data
		Humanoid.MaxHealth = 100 - Set Default Health
		Humanoid.Health = Humanoid.MaxHealth -- Sets same as MaxHealth
	end
end

-- Save The Health
function saveHealth(player)
	local Character = player.Character -- Character Of Player
	local Humanoid = Character:WaitForChild("Humanoid") -- Waits For The Humanoid To Be A Child Of The Character
	local Table = {Humanoid.MaxHealth} -- Puts Value Into A Table Used To Store The Data
	HealthData:SetAsync(DataKey..player.UserId,Table) -- Saves MaxHealth In Data Store
end

game.Players.PlayerAdded:Connect(function(player) 
	player.CharacterAdded:Connect(function(char)  -- Calls The loadHealth Function
		loadHealth(char)
		-- Save When MaxHealth Changes
		local Humanoid = char:WaitForChild("Humanoid")
		local OldMax = {}
		table.Insert(OldMax,Humanoid.MaxHealth)
		Humanoid.Changed:Connect(function() -- When Humanoid Properties Change
			if Humanoid.MaxHealth == OldMax[1] then return end -- Checks if maxhealth wasnt changed
			if Humanoid.MaxHealth ~= OldMax[1] then -- Checks if MaxHealth Was Changed
				saveHealth(player) -- Saves
				for i,v in pairs(OldMax) do -- Removes Old Value
					if v == Humanoid.MaxHealth then 
						table.remove(OldMax,i)
					end 
				end
				table.insert(OldMax,Humanoid.MaxHealth) -- Inserts New Value
			end
		end)
	end)
end)

game.Players.PlayerRemoving:Connect(saveHealth) -- Calls The saveHealth Function

i know someone else answered this but you still had some question about how to do it when the maxhealth changed so here it is.

ik the OldMax Table and stuff isnt very necessary but eh