re: and never ever seen FWIW, ROTFLMA or ICLIU but this is because of my ignorance

FWIW= For What It's Worth (something of questionable value, like free advice!)

ICLIU= I Could Look It Up... (and also YCLIU =You could look it up.)

and an old one, not used here, because 1) there really isn't any, and 2) really suited to using software is RTFM (cleaned up as RTM= Read The Manual (the F is a vulgar word, known world round)

another one you might not know is IMHO= In My Humble Opinion (which is rarely used by any one with a humble opinion!)