初心者 2 - 一般的な代名詞

a person who is not mentioned by name

誰か, ある人

a person whose identity is not specified or known

誰か（だれか）, 誰かさん（だれかさん）

used to mention a thing that is not known or named

何か, なんか

all the people that exist or are in a specific group

みんな, 全員

every single person in a group, community, or society, without exception

誰もが, 全ての人

all things, events, etc.

すべて, 全て

used when referring to a person or thing that was recently mentioned or one that is close in space or time

これ, こちら

used when referring to a person or thing that was previously mentioned or one that is not close in space or time

それ, あれ