I'm newbie and want to learn more from this forum.I want to know that How many topic I should post per day for getting ?which is the best topic for getting more merit ?
1 topic per day.
I've never met you but I can already know so much about you. You're the type of person that needs to research their topic before posting a thread. You need to to spend time to construct a hypothesis or premise, explain it clearly, and come to a conclusion or question (for us to respond to) concisely. This time will benefit you well. A more well written post or thought provoking thread will garner you more attention.
Oh, and post topics in threads that have more people with Merit. The Beginners & Help board isn't one of them.