From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :
HTH
Hope This Helps (slang)
From 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.
From The Free On-line Dictionary of Computing (30 December 2018) :
HTH
Hope This Helps. Often used sarcastically, see HAND.
(1998-03-06)