Top 100pronoun

э́то

[ˈɛtə]Generic demonstrative pronoun. Translated as "this" or "that", depending on the context.

Frequency rank #5 About 1 in every 48 words in Russian film and TV. The top 100 words make up 53.1% of everything said.

это #5

Meaning

Generic demonstrative pronoun. Translated as "this" or "that", depending on the context.
Used as a personal pronoun when not referring to a particular noun. Translated as "it".
used as a personal pronoun to indicate that something at the centre of a matter at hand is a certain thing; can be translated as "it" or "he", "she", "they", as appropriate

Э́то хорошо́.

That’s good.

Я хоте́л отве́тить на твоё сообще́ние, но не на э́то.

I meant to reply to your message, but not this one.

LangLeap's Russian course teaches this word.