This is a nice easy to get about site that gives some good explanations of the basics of things.
http://www.jjjtrain.com/vms/library.htmlSo if you see someone talking about a certain type of operation, you will be able to understand what it is all about. Plus you might learn a lot as well.
But please be aware that it is geared towards US terminology, so a few of the sayings or words or settings (eg angles on countersinks) might be misread or different if you are from another part of the world.
John