Athough this doesn't directly answer your question probably, (I don't understand it either), it will give you an excellent beginning point to learn.
The link below will take you to a whole bunch of "How Do I" videos on VB. In particular the "Forms over Data" series that relate to the topics in your question.
http://msdn.microsoft.com/en-us/vstudio/bb466226#formsoverdata[
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Hope this helps you to understand the basic concepts.