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i dont think the game can teach you how to make RPG, you dont need to learn how to send files to another computer or client and in the screenshot it is suggesting using database (AKA server) to do unnecessary stuff.

a database and a server are not the same at all.
a database stores information where as a server serves files to clients and other servers.

and i have no idea what you mean by this
"i dont think the game can teach you how to make RPG"
i did not once mention anything about making an RPG.

Large databases are often located on their own specific servers, so he's not quite wrong.