Re: Is anyone there to clear me about the test cases?
And a good way to learn how to write "good/effective test cases" is to write bad/ineffective test cases.
And like Lynne stated, you probably want to work with your team to learn what is expected of you.
And to get to a bigger question which you haven't identified: What constitutes, in your mind, a good test case? Similarly, what constitutes an effective test case? (Both of these questions have been debated on a number of occasions with SQAForums, you'll have to search to find them. But, for the purposes of this thread, I don't want to drudge them up.)