Hello! DataStores are an ever growing thing ROBLOX uses to help players save player data in game. Tables are usually the best way to do it!
But, thankfully, there have been methods of DataStores that are easy to use, and simple to operate with! I will provide you with some helpful links to checkout! These links are what helped me, and will help you if you put the time in to read them!
This is a DevForum Post that I found useful!
All of these links should provide you with enough information YOU NEED to start creating your very own DataStore system for tools, money, and more!