Shulchan Arukh, Orach Chayim Siman 661
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
בליל יום טוב שני אומר קידוש וזמן אחריו מיד ואח"כ ברכת סוכה [זו דעת הרא"ש וכן ראוי לנהוג]:
Mishna Berura Yomi
On the second night, we say Kiddush and Shehecheyanu immediately afterward, followed by the blessing over the sukkah. (This is the opinion of the Ros"h, and it is fitting to do this.)