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> I have searched about merit in this forum, but no result shows, so I thought there are no posts about this yet.
Youre kidding right? The following query on Google retrieves an overwhelming amount of results (the forums search function brings back a tremendous amount as expected, and you need to play around with the filters to get a well focused set of results):
site:bitcointalk.org merit
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> so if someone finds it is so helpful or useful then they might give me merit.
That is how it (often) goes. Nevertheless, one of the non-written rules is not to ask/beg for merit. Its actually rather counterproductive to do so (or at least you need to be a bit more subtle about it).