New to Glow and need abbreviation definitions plz :)

I am new to this community and a bit confused by all the random letters used got abbreviations lol a little help plz? I am TTC (the only abbreviation I do know! Lol) for almost 6 yrs now. I have a 10 yr old daughter and an almost 7 year old daughter. Been trying to conceive in hopes of having a son since my youngest was a year old. I would like to better understand some of the advice by knowing what all the abbreviations mean :) Thank u!