The Free On-line Dictionary of Computing (19 January 2023):

HTH

    Hope This Helps.  Often used sarcastically, see HAND.

   (1998-03-06)


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

HTH
 //

    [Usenet: very common] Abbreviation: Hope This Helps (e.g. following a
    response to a technical question). Often used just before HAND. See also
    YHBT.