Rabbi Baruch Bodenheim: Gemara Sukkah: Fifth Perek יום רביעי Elul 11, Daf 56a (09/07/22)

Learn the the גמרא דף נו. “בעצרת אומר לו הילך (two dots – seven lines from top of the Amud) until the two dots before the Mishna

Learn רא”ש פרק ד סימן ד who brings rishonim who rule that on the second night of Sukkos (in chutz laaretz) we switch the order and first day shehechiyanu and then make bracha leishev basukkah

https://hebrewbooks.org/pdfpager.aspx?req=14319&st=&pgnum=483

Learn שולחן ערוך אורח חיים ס’ תרמ”ג

https://hebrewbooks.org/pdfpager.aspx?req=60391&st=&pgnum=222

and ס’ תרס”א with the משנה ברורה

https://hebrewbooks.org/pdfpager.aspx?req=60391&st=&pgnum=268