Understanding Persistence.xml in JPA

I am trying to understand the following things: When I make an EJB project and deploys it to Glassfish do I set up JDBC resources/connection pools at the administrator center of Glassfish or do I add all the different properites for username, password etc in the persistence.xml? I don't understand one bit of that. I do not understand why we have both JDBC resource and JDBC Connection pool either. What is it and what is the difference between them? Could somebody explain me these things or/and provide some good link about the persistence.xml file and the part around it?

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