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(+1)

eh , in the linux quizz you ask the same question 2 times???

"which linux command is used to create multiple nested folders?"
which is the 2nd and 3rd question.

(+1)

SMTP,POP (emails are files).
PTP can be used to transfer files.
FTP (this is likely what you mean but the others are not incapable of the same thing)

(+1)(-1)

same kind of issue for the question on which port is used for http...
technically all ports can be used for it.

However, one specific well-known port is most commonly used, so that's the one to always answer.

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.