That's not necessarily true -- many Best Buys now have an Apple Computer section inside, and most of the people assigned to work in that section are Apple certified to do so.
That being said, not all Best Buys have this department (although most now do).
In reality, people SHOULDN'T be coming here first for questions like that. They should be looking at their user manual, and posting here only if they have a problem. This isn't a chat board -- it's a user to user help board. The first place people should check is what they already have -- their user manual. If you don't have yours handy, you can get the PDF here:
http://www.apple.com/support/macbookpro/