What is the base of roblox systems?

Good afternoon developers.
I’ve been learning programming at Roblox for a long time, but I’m still a bit lost about some things …
For example:
-How do I save items that a player has in his backpack?
-In a game, like Adopt me, how is the system of houses and property purchase made?

It is not necessary to answer the questions, please give me a way of where to start, and what I need to learn.
_all TY: D

Can you please stop making duplicated posts?
I’ve seen 2 other posts with this same content by the same author.

really sorry
I received a notification saying that the comment was on the wrong tab and I couldn’t move it, so I wrote it again here

Saving is being done by the DataStoreService.

For example to save the tools a user has. I recommend making a folder in ServerStorage with all your tools. And saving the names of the tools per UserId. You can then use GetAsync to get the names of the tools and clone them inside the player’s backpack.

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