Reading ZCML files will open up a world of understanding to you as a Plone developer. A ZCML file is basically a roadmap that explains how the pieces fit together.
If you're interested in how a Plone package works find the configure.zcml and it will lead you from there.
A Fancy but Simple Example - Collective.Multimail
The collective.multimail add-on is described as follows "Allows you to use
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