あなた is a polite, second-person pronoun used to refer directly to the person someone is speaking to. However, in daily Japanese conversation, it is rarely used; speakers often prefer using names or titles.
That is how Fuguro works. It brings あなた back for review right before you forget it, each time a little later, until it sticks for good. You hear it spoken aloud, and you meet it again in stories you can already read. The first five levels are free.