Can you name the various levels of software testing?

Could you define a test case?

Why do we write black-box test cases first and not white box test cases?

Can you list some advantages of automation testing?

In your opinion, what will happen to the cost of a software product in a defect that could have been removed during the initial stage of testing is removed/fixed later?

Please enlist the various basic components of the defect report format?

List the various components of Selenium?

Can you name parameters that give out the efficiency of automation testing?

Please define XPath.