Translation of vierzehntäglich

In the meantime I am listening to some Spanish CDs. They are intended for the car, but no one can tell you when to listen to it, how many times and how often. Please understand that I work a lot.
The image width is ideal on all pages except on the front page. The image width there is almost double. Why? The introduction text could be on the left side, cause that is where people start reading.
Let me understand further: If you go through the 'vocabulary builder' in the left menu and choose new lesson it works faster than when you get there through the list of all lessons? Did I get this right?