One of the main reasons for coming to this site is for help on passing the Professional Engineering Exam. This is the test which engineers must take to become certified. I would equate it to being similar to a lawyer before and after they pass the bar.
In time, I hope for WIkiEngineer to develop a study guide which you will be able to follow the links and gather a greater understanding (with examples) of separate topics. There will also be other aides to help you pass.