The Free On-line Dictionary of Computing (19 January 2023):
RTFAQ
(Usenet, primarily written, by analogy with RTFM) Read the
FAQ!
An exhortation that the person addressed ought to read the
newsgroup's FAQ list before posting questions.
[Jargon File]
(1994-12-08)
The Jargon File (version 4.4.7, 29 Dec 2003):
RTFAQ
/R·T·F·A·Q/, imp.
[Usenet: primarily written, by analogy with RTFM] Abbrev. for ‘Read the
FAQ!’, an exhortation that the person addressed ought to read the
newsgroup's FAQ list before posting questions.