I had no idea either, when I first started bumping, haha. I literally used a cheat sheet and silently cursed everyone for using abbreviations. Just spell it out! After some time it clicked and it is, quite honestly, easier to use abbreviations. Although I hate the DD stuff (dear daughter, dear husband, et.) Sounds strange to me when I read it in my head, so I just say "My H" when referring to the hubs. But that's just me. Also, welcome!
Re: Total novice here (what's with all the abbreviations)
DS: Born 5-17-16
Married: 1/2008 ~ DD#1: 3/2012
TTC #2: Started 4/2014 BFP 7/30/15 MC 8/3/15 BFP 9/4/2015 EDD 5/16/2016