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Xcode includes numerous project templates. Choosing the right template when you're creating a new project can go a long way in getting your project going in the right direction.
Both the new project assistant and the Xcode documentation include short descriptions of each template—too short, in my opinion. For example, the CoreFoundation Tool template is described as "A tool that links against the Core Foundation library." That's all well and good if you know what the Core Foundation library is or how it differs from the Core Services library and the Foundation framework. While the descriptions of the templates in this appendix are brief, you should find them substantially more enlightening than the descriptions found in the new project assistant.