The mechanics of the website.
The site has many features and many tasks can been done in multiple ways. I'm going to cover a few of them for you. All the information you need to know, from searching to checkout can be found or performed in several ways. The more you know about the power of the site, the more you can pick what works best for you and the more time and money you'll end up saving. Also of work actually goes into a site like this and some functions are never known able or are just used correctly.
Click on a link above to get started.