The Jargon File (version 4.4.7, 29 Dec 2003):

source of all good bits
 n.

    A person from whom (or a place from which) useful information may be
    obtained. If you need to know about a program, a guru might be the source
    of all good bits. The title is often applied to a particularly competent
    secretary.


The Free On-line Dictionary of Computing (30 December 2018):

source of all good bits

    A person from whom (or a place from which)
   useful information may be obtained.  If you need to know about
   a program, a guru might be the source of all good bits.  The
   title is often applied to a particularly competent secretary.

   [Jargon File]

   (2001-01-27)