This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
What they are trying to tell you is that the servlet (with it's appropriate package structure) is to be placed in those directories. Remeber that com.da.DararaServlet is the fully qualified name of the class. So naturally DararaServlet would be found under WEB-INF/classes/com/da/ (or in a jar file under WEB-INF/lib (again with it's appropriate package structure in the jar file)