1)There’s split מנהגים as to if the חזן should say ה׳ שפתי תפתח וכו׳ out loud during חזרת הש״ץ or not, do what the מנהג of the shul is. 🗣️

2) You don’t need to stand during חזרת הש״ץ, but it is definitely nice to. 🧍‍♂️

3)It is completely אסור to talk during חזרת הש”ץ, some shuls were even destroyed because of it. 😱🤯💥