Sometimes it’s difficult to explain airplane systems because you can’t usually see the moving parts of an engine. Today, I stumbled across a site that shows how car engines and systems work. Though, some of the systems in airplanes are different (air cooled, for instance), many of the concepts and designs are the same. Without further explanation, this site might help clarify some things. Hopefully you can learn something you didn’t know!
And while I’m at it, here is how a jet engine works.