There Is Definitely A Difference...

Knowing how to do something and understanding how to do something. Most people understand the mechanics of things, like spark plugs in a car - everyone knows what they do, why they are required, how in theory to replace one. But only someone trained and experienced would know what kind of spark plug to use, where to locate the spark plug, how to efficiently remove and replace it. I'm not saying I can't replace a spark plug I'm just saying people who don't know how to change a spark plug don't necessarily not understand spark plugs. There are things that come with experience and application - knowing the basics is not knowing everything. How to apply these basics is a whole different concept. Isn't it?