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 Seif
SHUA Shulchan Aruch
SK Seif Katan
WTM Whats The Mekor (?)
YMMV Your Minhag May Vary