Welcome to this site, Mr. Dev Kumar.
I would suggest you to understand the functioning of the site. Know about various sections and sub-sections of the site. Try to understand in which section/sub-section your are most comfortable. Read the help topics. Start contributing, and after the end of the month, check the revenue you have earned.
First learn, then contribute and after that, earn from this site.
Beware! I question everything and everybody.