Right. I did not go into filter factor, bellows factor, or reciprocity factor. Those were beyond the scope of my post. And yes, do visit the web page. It explains in much more detail how exposure works. Print the charts and follow them as they cover most of the situations you will encounter.
I've also found it useful to put the palm of my hand in the same light as my subject, meter off of it, and open one stop. This works well for photographers with caucasian skin. It's a "poor man's incident meter". For those with different skin tone than caucasians, YMMV.