1this; this one — a demonstrative pronoun for something near the speaker or for what the speaker is pointing to or discussing.
これ、いくらですか。
How much is this?
これは母からの誕生日プレゼントです。
This is a birthday present from my mother.
これを見れば、使い方が分かります。
If you look at this, you'll understand how to use it.
これが昨日話していた新しい企画です。
This is the new project we were talking about yesterday.
2this person — used informally when referring to or introducing someone, especially a family member or someone in the speaker's group.
これ、弟の健太です。
This is my younger brother, Kenta.
これがうちのチームのリーダーです。
This is our team's leader.
3now; this point in time — a temporal use found chiefly in expressions such as これから and これまで.
これから会議が始まります。
The meeting will begin now.
これまでの経験を仕事に生かしたいです。
I want to make use of my experience so far in my work.
4here — a somewhat dated use that remains mainly in set expressions such as これより先.
これより先は立入禁止です。
No entry beyond this point.
5A formal or literary use that emphasizes the subject or topic; it is rarely used in modern everyday speech.
これ、まことに喜ばしい知らせなり。
This is truly welcome news. (literary style)
6An archaic first-person pronoun meaning I or me; it is not used in modern Japanese.