en_tn_condensed/zec/02/10.md

Sing for joy, daughter of Zion

"Zion" is the same as "Jerusalem." The prophet speaks of the city as if it is a daughter. Possible meanings are 1) Zechariah personifies the city as a person who can sing. Alternate translation: "Sing for joy, Zion" or 2) the phrase "daughter of Zion" is a metonym for the people who live in the city. Alternate translation: "Sing for joy, people of Zion" (See: rc://en/ta/man/jit/figs-metaphor and rc://en/ta/man/jit/figs-personification and rc://en/ta/man/jit/figs-metonymy)

this is Yahweh's declaration

Yahweh speaks of himself by name to express the certainty of what he is declaring. See how you translated this in Zechariah 1:4. Alternate translation: "this is what Yahweh has declared" or "this is what I, Yahweh, have declared" (See: rc://en/ta/man/jit/figs-123person)