Although there are alot of acronyms that are used here and there, here are some of the acronyms that i use alot in workplace to get information straight without any hassel.

AFAIK = As fas as i know
AFK = Away from keyboard
IDK = I don't know
FWIW = For what it worth
FYI = For your information
LGTM = Looks good to me
SGTm = Sounds good to me
K = Ok
TA = Thank you
BTW = By the way
IMHO = In my honest opinion
IMO = In my opinion
BRB = Be right back
TBH = To be honest
W/ = With
W/O = Without
FTFY = Fixed that for you
TTYL = Talk to you later.
TA = Thank you
HTH = Hope this helps
RTFM = Read the F****G Manual ( but also post link to the manual and key words to check for)