The definition of Quality Post is subjective
One member may find your post as "quality post" then will give you a merit while other members may just engage you with a discussion without giving any merit. Hence, I would like to suggest that just make it a habit to post something substantial and always (yes, always) be mindful of the rules of the forum. Prevent yourself to be part of the ignored list of the merit sources.
I think giving a merit is really subjective. As i have said above, we have our own definition of "quality post" and expectations to the users of this forum. In my case, I would like to recommend to have lesser expectation on the "quality" of the post of a newbie compare to a full member/legendary.