Zechariah begins with eight visions, continues with four messages, and finishes with two oracles, literally “burdens”, a word often used to refer to prophetic revelations of the future. Each oracle spans three chapters, the first beginning in chapter 9 and the second commencing with the first verse of chapter 12. I have called the first oracle “against the nations” because it commences with words of coming judgment concerning the nations immediately west and north of Israel, later going on to mention Greece, Egypt, Assyria and other ethnic groups further afield.
There’s plenty about Israel in the first oracle as well, but it’s definitely more general than the second oracle, which is specifically “concerning Israel”, Judah included.