Some Lomdishe Acronyms For This Thread (Feel free to update the wiki as needed.)
AYLR – Ask Your Local Rabbi
KHLH – כל המקיל לא הפסיד
IMHnrO - In My Humble non-rabbinic Opinion
MB – Mishna Berura
MM - Mar'eh Makom
MMR – Machlokes Mechaber & Rema
NM - Nafka Minah
S – Siman
SF – Se’if
SHUA – Shulchan Aruch
SK – Se’if Katan
WTM – What’s The Mekor (?)
YMMV – Your Minhag May Vary